Gutenberg block editor basics in Wordpress - Deep Dive

Overview - Gutenberg block editor basics

What is it?

The Gutenberg block editor is a tool in WordPress that lets you build pages and posts by stacking blocks. Each block can be a paragraph, image, heading, or other content type. This makes creating rich layouts easier without needing to write code. It replaces the old editor with a more visual and flexible way to design content.

Why it matters

Before Gutenberg, editing WordPress content was like writing in a plain notebook with no pictures or special layouts. Gutenberg solves this by letting anyone create complex pages with images, text, and media arranged exactly how they want. Without it, users would need technical skills or plugins to make attractive pages, slowing down website creation and updates.

Where it fits

Learners should know basic WordPress usage and how to create posts or pages before learning Gutenberg. After mastering Gutenberg basics, they can explore custom block development, advanced layout design, and integrating third-party blocks for more power.

Mental Model

Core Idea

Gutenberg turns content into building blocks you can move, edit, and style independently to create flexible page layouts.

Think of it like...

It's like playing with LEGO bricks where each brick is a piece of content you can stack, rearrange, or customize to build your own unique structure.

┌───────────────┐
│ Page or Post  │
├───────────────┤
│ ┌───────────┐ │
│ │ Block 1   │ │
│ ├───────────┤ │
│ │ Paragraph │ │
│ └───────────┘ │
│ ┌───────────┐ │
│ │ Block 2   │ │
│ ├───────────┤ │
│ │ Image     │ │
│ └───────────┘ │
│      ...      │
└───────────────┘

Build-Up - 7 Steps

1

Foundation

Understanding Blocks as Content Units

Concept: Blocks are the basic units of content in Gutenberg, each representing a specific type like text, image, or video.

In Gutenberg, instead of writing all content in one big box, you add separate blocks. For example, a paragraph block holds text, an image block holds a picture, and a heading block holds a title. You can add, move, or delete these blocks independently.

Result

You can create content by stacking different blocks, making it easier to organize and edit parts separately.

Understanding blocks as independent pieces helps you see content as flexible parts, not one fixed chunk.

2

Foundation

Adding and Editing Blocks

Concept: You learn how to insert new blocks and change their content or settings.

To add a block, click the plus (+) button and choose the block type. Then type or upload content inside it. Each block has its own toolbar and settings panel where you can change styles, alignment, or other options.

Result

You can build pages by adding different blocks and customizing each one’s appearance and content.

Knowing how to add and edit blocks is the foundation for creating any page or post with Gutenberg.

3

Intermediate

Rearranging and Nesting Blocks

🤔Before reading on: do you think blocks can only be placed one after another, or can they be nested inside each other? Commit to your answer.

Concept: Blocks can be moved up or down and some blocks can contain other blocks inside them.

You can drag blocks to reorder them or use arrow buttons. Some blocks, like columns or groups, let you put blocks inside them to create complex layouts. Nesting helps organize content visually and structurally.

Result

You can create multi-column layouts or grouped sections by nesting blocks, making pages more dynamic.

Knowing blocks can nest unlocks powerful layout possibilities beyond simple vertical stacking.

4

Intermediate

Using Block Settings and Styles

🤔Before reading on: do you think all blocks share the same style options, or do they have unique settings? Commit to your answer.

Concept: Each block type has its own settings and style options to customize its look and behavior.

When you select a block, a sidebar shows options like colors, font size, spacing, or special features. For example, a button block lets you change its color and link, while an image block lets you add alt text and resize. These settings help tailor each block to your design needs.

Result

You can make each block look and behave differently, creating visually appealing and accessible content.

Understanding block-specific settings helps you use Gutenberg’s flexibility to its fullest.

5

Intermediate

Saving and Reusing Custom Blocks

🤔Before reading on: do you think you can save a block you made to use again later, or must you recreate it every time? Commit to your answer.

Concept: You can save blocks or groups of blocks as reusable blocks to insert them easily in other posts or pages.

After creating a block or group you like, you can save it as reusable. Later, you add it from the reusable blocks list. Changes to a reusable block update everywhere it’s used, saving time and keeping consistency.

Result

You can build a library of custom blocks to speed up content creation and maintain uniform design.

Knowing reusable blocks saves effort and helps keep your site’s look consistent.

6

Advanced

Exploring Block Patterns for Layouts

🤔Before reading on: do you think you must build every layout block by block, or can you start from pre-made block groups? Commit to your answer.

Concept: Block patterns are pre-designed groups of blocks you can insert to quickly build complex layouts.

WordPress and plugins offer block patterns like hero sections, galleries, or contact forms. You insert a pattern and then customize it. This speeds up building pages without starting from scratch.

Result

You can create professional-looking pages faster by using and customizing block patterns.

Understanding block patterns helps you leverage community and theme resources for efficient design.

7

Expert

Custom Block Development and Extending Gutenberg

🤔Before reading on: do you think Gutenberg blocks are fixed, or can developers create new custom blocks? Commit to your answer.

Concept: Developers can build custom blocks with code to add unique features or designs beyond default blocks.

Using JavaScript and React, developers create blocks tailored to specific needs, like custom forms or interactive content. These blocks integrate seamlessly with Gutenberg and can have custom controls and styles. This extends Gutenberg’s power for complex sites.

Result

Sites can have unique, advanced content blocks that fit exact requirements, improving user experience and site capabilities.

Knowing how to develop custom blocks reveals Gutenberg’s true extensibility and future-proofing.

Under the Hood

Gutenberg uses JavaScript and React to render blocks as components in the editor. Each block type has a definition with how it looks in the editor and how it saves content as HTML comments with JSON metadata. When rendering on the site, WordPress parses these saved blocks to display the final content. This separation allows live editing and flexible layouts.

Why designed this way?

Gutenberg was designed to modernize WordPress editing by moving from a single text box to a component-based system. React was chosen for its efficient UI updates. Saving blocks as HTML with metadata keeps backward compatibility and allows themes and plugins to interact with content easily.

┌───────────────┐        ┌───────────────┐
│ Editor (React)│─────▶  │ Block Registry│
└──────┬────────┘        └──────┬────────┘
       │                        │
       │ Render blocks          │
       ▼                        ▼
┌───────────────┐        ┌───────────────┐
│ Block Content │◀─────  │ Saved HTML +  │
│ (Editable UI) │        │ JSON Metadata │
└───────────────┘        └───────────────┘
       │                        │
       ▼                        ▼
┌───────────────────────────────────────────┐
│ Frontend Rendering by WordPress PHP Parser │
└───────────────────────────────────────────┘

Myth Busters - 4 Common Misconceptions

Quick: Do you think Gutenberg replaces all plugins for page building? Commit to yes or no.

Common Belief: Gutenberg is a full replacement for all page builder plugins.

Reality: Gutenberg provides core block editing but some advanced page builders offer more design control and features beyond Gutenberg’s scope.

Why it matters: Assuming Gutenberg replaces all plugins can lead to missing needed tools or overestimating its capabilities, causing frustration.

Quick: Do you think all content created with Gutenberg blocks is locked and cannot be edited outside WordPress? Commit to yes or no.

Common Belief: Content made with Gutenberg blocks is locked into WordPress and hard to export or reuse elsewhere.

Reality: Gutenberg saves content as HTML with block metadata, which can be parsed and exported. Some tools allow reuse or migration.

Why it matters: Believing content is locked limits thinking about content portability and integration with other systems.

Quick: Do you think blocks can only be arranged vertically, or can they be placed side by side? Commit to your answer.

Common Belief: Blocks can only be stacked vertically, one after another.

Reality: Blocks can be arranged side by side using columns or group blocks that support horizontal layouts.

Why it matters: Not knowing about horizontal layouts limits design creativity and page structure.

Quick: Do you think reusable blocks update everywhere automatically or only where you edit them? Commit to your answer.

Common Belief: Reusable blocks are just copies and do not update everywhere when changed.

Reality: Reusable blocks are linked instances; editing one updates all places where it’s used.

Why it matters: Misunderstanding this can cause accidental site-wide changes or duplicated effort.

Expert Zone

1

Some blocks use server-side rendering to generate dynamic content, blending PHP and JavaScript for flexibility.

2

Block metadata is stored in HTML comments, allowing backward compatibility and easy parsing by WordPress core and plugins.

3

The editor’s React components use a virtual DOM to efficiently update only changed blocks, improving performance.

When NOT to use

Gutenberg is not ideal for highly customized or complex layouts requiring pixel-perfect control; in such cases, specialized page builders or custom theme templates may be better.

Production Patterns

Professionals use reusable blocks for consistent branding, block patterns for rapid page assembly, and custom blocks to integrate business-specific features like booking forms or product showcases.

Connections

Component-based UI frameworks

Gutenberg’s blocks are React components, sharing the same principles of modular UI building.

Understanding React components helps grasp how Gutenberg renders and manages blocks dynamically.

Modular design in architecture

Both use independent units that fit together to create complex structures.

Seeing content as modular blocks is like building a house from prefabricated parts, making construction flexible and efficient.

Database normalization

Separating content into blocks is similar to organizing data into tables to reduce duplication and improve management.

Knowing this helps understand why breaking content into blocks improves editing and reuse.

Common Pitfalls

#1 Trying to edit content by switching to the classic editor instead of using blocks.

Wrong approach:

Switching to classic editor plugin and ignoring Gutenberg blocks.

Correct approach:

Learn to use Gutenberg blocks directly for modern editing and layout control.

Root cause:

Misunderstanding that Gutenberg is the future of WordPress editing and that classic editor is legacy.

#2 Overusing reusable blocks for content that should be unique per page.

Wrong approach:

Saving every block as reusable even if content varies per page.

Correct approach:

Use reusable blocks only for truly repeated content like calls to action or branding elements.

Root cause:

Confusing reusable blocks with regular blocks and not understanding their linked nature.

#3 Ignoring accessibility settings in blocks like alt text for images.

Wrong approach:

Uploading images without adding alt text or descriptive labels.

Correct approach:

Always add alt text and use semantic blocks to ensure accessibility.

Root cause:

Lack of awareness about accessibility importance and block settings.

Key Takeaways

Gutenberg uses blocks as building units to create flexible and rich WordPress content layouts.

Each block can be added, edited, moved, and styled independently, making content management easier.

Blocks can be nested and grouped to build complex page structures beyond simple stacking.

Reusable blocks and block patterns speed up content creation and maintain design consistency.

Developers can extend Gutenberg by creating custom blocks, unlocking powerful site-specific features.

Practice

1. What is the main purpose of Gutenberg blocks in WordPress?

easy

A. To build content visually by stacking pieces called blocks

B. To write PHP code for themes

C. To manage user roles and permissions

D. To create database tables

Solution

1. Step 1: Understand Gutenberg blocks concept

   Gutenberg blocks allow users to build content visually by stacking blocks instead of writing code.

2. Step 2: Compare options with this concept

   Options A, B, and D relate to other WordPress functions, not content building with blocks.

3. Final Answer:

   To build content visually by stacking pieces called blocks -> Option A

4. Quick Check:

   Gutenberg blocks = Visual content building [OK]

Hint: Blocks stack visually to build content, not code or settings [OK]

Common Mistakes:

• Confusing blocks with coding PHP
• Thinking blocks manage users or database
• Mixing blocks with theme development

2. Which of the following is the correct way to define the edit function in a custom Gutenberg block?

easy

A. function edit() { Hello Block; }

B. def edit(): return 'Hello Block'

C. edit = function() { echo 'Hello Block'; }

D. const edit = () => { return Hello Block; };

Solution

1. Step 1: Identify JavaScript syntax for Gutenberg blocks

   Gutenberg blocks use modern JavaScript with arrow functions for edit.

2. Step 2: Check each option's syntax

   const edit = () => { return <p>Hello Block</p>; }; uses arrow function returning JSX, which is correct. function edit() { <p>Hello Block</p>; } does not return the JSX element. edit = function() { echo 'Hello Block'; } uses PHP syntax, and B uses Python syntax, both invalid here.

3. Final Answer:

   const edit = () => { return <p>Hello Block</p>; }; -> Option D

4. Quick Check:

   Gutenberg edit uses JS arrow functions [OK]

Hint: Gutenberg edit uses JavaScript arrow functions returning JSX [OK]

Common Mistakes:

• Using PHP or Python syntax instead of JavaScript
• Not returning JSX properly
• Using old function syntax without React import

3. Given this simple block edit function, what will be rendered in the editor?

const edit = () => {
  return <p>Welcome to Gutenberg!</p>;
};

medium

A. A paragraph with text 'Welcome to Gutenberg!'

B. An empty block with no content

C. A syntax error preventing rendering

D. A button labeled 'Welcome to Gutenberg!'

Solution

1. Step 1: Analyze the edit function return value

   The function returns a paragraph element with the text 'Welcome to Gutenberg!'.

2. Step 2: Understand editor rendering behavior

   The editor shows the returned JSX content, so a paragraph with that text appears.

3. Final Answer:

   A paragraph with text 'Welcome to Gutenberg!' -> Option A

4. Quick Check:

   JSX return = paragraph text shown [OK]

Hint: JSX returned in edit shows as block content in editor [OK]

Common Mistakes:

• Thinking it renders a button
• Assuming syntax error without checking code
• Expecting empty content when JSX is returned

4. What is wrong with this Gutenberg block save function?

const save = () => {
  <div>Saved content</div>;
};

medium

A. save function should be async

B. Using <div> instead of <p> tag

C. Missing return statement in the save function

D. save function cannot use JSX

Solution

1. Step 1: Check function syntax for returning JSX

   The save function has JSX but no return statement, so it returns undefined.

2. Step 2: Understand save function requirements

   Save must return JSX to render saved content; missing return causes no output.

3. Final Answer:

   Missing return statement in the save function -> Option C

4. Quick Check:

   JSX must be returned in save function [OK]

Hint: Always return JSX in save function to render content [OK]

Common Mistakes:

• Forgetting return keyword
• Thinking tag choice causes error
• Assuming save must be async

5. You want to create a custom Gutenberg block that shows a user-editable heading and paragraph. Which two functions must you define to make this block work properly?

hard

A. registerBlockType and enqueueScripts only

B. edit and save functions to handle editing and saving content

C. PHP render callback and CSS styles only

D. enqueueScripts and enqueueStyles only

Solution

1. Step 1: Identify core Gutenberg block functions

   Every block needs an edit function to show editing UI and a save function to define saved content.

2. Step 2: Compare options with required functions

   edit and save functions to handle editing and saving content correctly lists edit and save. Other options mention scripts or PHP but miss these core functions.

3. Final Answer:

   edit and save functions to handle editing and saving content -> Option B

4. Quick Check:

   Blocks need edit + save functions [OK]

Hint: Blocks always need edit and save functions [OK]

Common Mistakes:

• Thinking only scripts or PHP are enough
• Forgetting save function
• Confusing enqueueing scripts with block logic