Full Site Editing basics in Wordpress - Deep Dive

Overview - Full Site Editing basics

What is it?

Full Site Editing (FSE) is a way to build and customize every part of a WordPress website using blocks. Instead of just editing posts or pages, you can design headers, footers, sidebars, and more with the same block tools. It lets you see and change your whole site’s look and layout without needing code. This makes website design easier and more flexible for everyone.

Why it matters

Before Full Site Editing, changing your site's design often meant learning code or using separate tools for different parts. FSE solves this by giving you one simple way to edit everything visually. Without it, many people would struggle to make their websites look unique or update them quickly. FSE empowers users to create professional sites faster and with less frustration.

Where it fits

You should know basic WordPress usage, like creating posts and pages with the block editor. After learning FSE basics, you can explore advanced block patterns, theme building, and custom templates. This fits into the journey from simple content editing to full control over site design.

Mental Model

Core Idea

Full Site Editing lets you build your entire website visually by arranging blocks for every part, not just content.

Think of it like...

Imagine building a house with LEGO blocks where you can snap together walls, windows, doors, and furniture all in one place, instead of building just the rooms separately.

┌─────────────────────────────┐
│        Full Site Editing     │
├─────────────┬───────────────┤
│ Header Block│ Content Block │
├─────────────┼───────────────┤
│ Sidebar     │ Footer Block  │
└─────────────┴───────────────┘

Each block is a piece you can move or change to build the whole site.

Build-Up - 7 Steps

1

Foundation

Understanding WordPress Blocks

Concept: Blocks are the basic building pieces in WordPress for adding content and design elements.

In WordPress, blocks let you add text, images, buttons, and more by placing small pieces called blocks. Each block does one thing, like a paragraph or an image. You can move blocks around and change their settings easily.

Result

You can create posts and pages by stacking blocks, making content flexible and easy to edit.

Understanding blocks is key because Full Site Editing uses these same blocks to build every part of your website, not just posts.

2

Foundation

What Full Site Editing Changes

Concept: FSE expands blocks from content to the entire site layout and design.

Traditionally, WordPress themes controlled headers, footers, and sidebars with code. FSE lets you edit these parts using blocks, just like editing a page. This means you can customize your whole site visually without coding.

Result

You gain control over all site parts with the block editor, making design changes faster and more intuitive.

Knowing this shift helps you see why FSE is a big step forward in website building.

3

Intermediate

Using Site Editor and Templates

🤔Before reading on: do you think templates are fixed layouts or customizable with blocks? Commit to your answer.

Concept: Templates are page layouts you can edit with blocks to change site structure.

The Site Editor is a special WordPress tool where you edit templates like the homepage or single post layout. Templates are made of blocks arranged to form the page structure. You can add, remove, or move blocks to change how pages look.

Result

You can create unique page designs by customizing templates visually.

Understanding templates as block arrangements unlocks the power to control site-wide layouts without code.

4

Intermediate

Exploring Template Parts

🤔Before reading on: do you think template parts are reusable or unique to each page? Commit to your answer.

Concept: Template parts are reusable block groups like headers or footers used across multiple pages.

Template parts let you build sections like headers or footers once and use them everywhere. Editing a template part updates it on all pages that use it. This saves time and keeps your site consistent.

Result

You manage repeated site sections efficiently and maintain a uniform look.

Knowing template parts helps you organize your site design smartly and avoid repetitive work.

5

Intermediate

Working with Global Styles

🤔Before reading on: do you think global styles affect individual blocks or the whole site? Commit to your answer.

Concept: Global styles control colors, fonts, and spacing across all blocks and templates.

Global styles let you set design rules like font size or color once, and they apply everywhere on your site. You can adjust these styles in the Site Editor to keep your design consistent and easy to update.

Result

Your site maintains a cohesive look, and style changes are quick and site-wide.

Understanding global styles shows how to manage design efficiently at scale.

6

Advanced

Creating Custom Block Patterns

🤔Before reading on: do you think block patterns are single blocks or groups of blocks? Commit to your answer.

Concept: Block patterns are saved groups of blocks you can reuse to build pages faster.

You can create custom block patterns by grouping blocks together and saving them. Later, you insert these patterns anywhere on your site to keep design consistent and speed up editing.

Result

You build pages faster with ready-made block groups tailored to your style.

Knowing how to create and use block patterns boosts productivity and design consistency.

7

Expert

Understanding Theme JSON and FSE Themes

🤔Before reading on: do you think theme.json is for content or site design settings? Commit to your answer.

Concept: Theme JSON is a configuration file that controls global styles and block settings for FSE themes.

FSE themes use a file called theme.json to define colors, fonts, spacing, and block options. This file tells WordPress how blocks should look and behave site-wide. Editing theme.json lets developers customize the design system behind the blocks.

Result

Themes become more flexible and powerful, enabling consistent design control across the site.

Understanding theme.json reveals how FSE themes manage design rules centrally, making site-wide changes easier and more reliable.

Under the Hood

Full Site Editing works by extending the block editor to control all site parts. WordPress stores templates and template parts as block-based HTML in the database. The Site Editor reads these blocks and renders them visually. The theme.json file provides a centralized style guide that the editor and blocks follow. When you edit a template or template part, WordPress updates the stored block content, which changes the site's output dynamically.

Why designed this way?

FSE was designed to unify content and design editing in WordPress. Previously, themes used PHP code for layouts, which was hard for non-coders to change. Blocks and theme.json provide a modern, flexible system that separates design from code, making customization accessible. This approach also prepares WordPress for future improvements and better performance.

┌───────────────┐      ┌───────────────┐      ┌───────────────┐
│  Site Editor  │─────▶│ Templates &   │─────▶│ Rendered Site │
│ (block UI)    │      │ Template Parts│      │ (HTML output) │
└───────────────┘      └───────────────┘      └───────────────┘
         │                     ▲                      ▲
         │                     │                      │
         ▼                     │                      │
┌───────────────┐              │                      │
│  theme.json   │──────────────┘                      │
│ (style rules) │                                     │
└───────────────┘                                     │
                                                      │
                                              ┌───────────────┐
                                              │  Browser View │
                                              └───────────────┘

Myth Busters - 4 Common Misconceptions

Quick: Does Full Site Editing replace all themes or work with them? Commit to yes or no.

Common Belief: Full Site Editing means you no longer need themes at all.

Reality: FSE works with special block-based themes designed for it; traditional themes still exist and work differently.

Why it matters: Thinking themes are obsolete can cause confusion and break sites if you try to use FSE features with incompatible themes.

Quick: Can you edit every single WordPress site part with FSE right now? Commit to yes or no.

Common Belief: Full Site Editing lets you edit every part of any WordPress site immediately.

Reality: FSE features depend on the theme and WordPress version; some parts may not be editable yet or require specific themes.

Why it matters: Expecting full control everywhere can lead to frustration when features are limited or unavailable.

Quick: Do global styles override individual block styles always? Commit to yes or no.

Common Belief: Global styles always override any block-level style settings.

Reality: Block-level styles can override global styles if set explicitly, allowing flexible design choices.

Why it matters: Misunderstanding this can cause unexpected design results and confusion when customizing styles.

Quick: Is theme.json only for developers and not editable by site owners? Commit to yes or no.

Common Belief: Only developers can change theme.json; site owners cannot customize global styles easily.

Reality: Site owners can adjust many global styles through the Site Editor UI without touching theme.json directly.

Why it matters: Believing this limits site owners from exploring powerful design customization tools available in FSE.

Expert Zone

1

Theme.json supports multiple style presets and can switch them dynamically, enabling advanced design systems.

2

Template parts can be nested inside other template parts, allowing complex reusable layouts.

3

FSE stores templates as block markup in the database, which means direct database edits can break site layouts if not careful.

When NOT to use

FSE is not ideal if you rely on legacy themes or plugins that do not support block-based templates. In such cases, classic themes or page builders like Elementor may be better. Also, for very simple sites, traditional editing might be faster.

Production Patterns

Professionals use FSE to create custom themes with reusable template parts and global styles for brand consistency. They build block patterns for marketing teams to quickly assemble pages. Theme.json is used to enforce design tokens and accessibility standards across large sites.

Connections

Component-Based UI Design

FSE builds websites by composing reusable blocks, similar to how component-based UI frameworks build apps.

Understanding component design in software helps grasp how blocks can be combined and reused to build complex site layouts.

Modular Furniture Assembly

Like assembling furniture from modular pieces, FSE lets you build a site by snapping together blocks and templates.

This connection shows how modular design principles apply both in physical objects and digital site building.

Document Object Model (DOM)

FSE manipulates the site's structure as blocks, which correspond to DOM elements in the browser.

Knowing how the DOM works clarifies how block changes affect the rendered webpage and why structure matters.

Common Pitfalls

#1 Trying to use Full Site Editing features with a classic theme that does not support blocks.

Wrong approach:

Activate a classic PHP-based theme and expect to edit header/footer with blocks in the Site Editor.

Correct approach:

Use a block-based FSE theme designed for Full Site Editing to access all editing features.

Root cause:

Confusing theme types and assuming all themes support FSE leads to broken or missing editing options.

#2 Editing template parts directly without understanding their reuse across pages.

Wrong approach:

Change the header template part without realizing it affects every page using it.

Correct approach:

Plan changes to template parts carefully, knowing edits apply site-wide, or create new parts if needed.

Root cause:

Not recognizing template parts are shared components causes unintended site-wide design changes.

#3 Overriding global styles with conflicting block styles causing inconsistent design.

Wrong approach:

Set different colors on individual blocks that clash with global style settings.

Correct approach:

Use global styles for main design and override block styles sparingly and intentionally.

Root cause:

Lack of understanding style hierarchy leads to messy and inconsistent site appearance.

Key Takeaways

Full Site Editing lets you build and customize every part of a WordPress site using blocks, not just content.

Templates and template parts are block-based layouts that you can edit visually to control site structure and repeated sections.

Global styles and theme.json provide centralized control over colors, fonts, and spacing for consistent design.

Using block patterns and template parts improves efficiency and keeps your site design uniform.

FSE requires compatible block-based themes and understanding its structure to avoid common pitfalls and unlock its full power.