Knowing WordPress theme terms is not the same as knowing how to build a theme for a real site. A first project forces you to choose between block and classic approaches, provide the files WordPress expects, understand how it selects templates, and decide how much control the site owner should have. The right place to start depends on the project—not a universal ranking of theme types.
What changes when a theme has to serve a real project?
A theme is more than a visual design translated into CSS. Even a small theme needs a recognized starting structure; a working project then requires choices about page layouts, reusable parts, and the editing experience the site owner will use. WordPress’s official Theme Handbook distinguishes themes’ presentation and structure from functionality added through PHP files, which is a useful boundary when deciding what belongs in the theme.
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The work also differs by architecture. A block theme brings together block-based templates and parts, theme settings, and the Site Editor. A classic theme brings PHP templates, template tags, the Loop, theme functions, and conditional tags. Neither list is just vocabulary: each points to a different way of building and maintaining the site.
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Should you learn block themes or classic themes first?
Start with the project’s editing requirements. If the site owner should be able to change templates, styles, navigation, and other site parts through the Site Editor, a block theme is a natural path to explore. If the project calls for PHP templates and the classic customization model, start with classic-theme development. The WordPress Theme Handbook describes both approaches and recommends reading both sections to understand their differences and choose what to build.
| Decision | Block theme | Classic theme |
|---|---|---|
| Main implementation | Primarily HTML and theme configuration, with block-based templates and parts | Primarily PHP, CSS, JavaScript, and WordPress functions, hooks, and filters |
| Site-owner editing | The Site Editor can edit site parts, including templates and styles | Uses PHP templates and the classic customization model; the Site Editor is not supported for classic themes |
| Template files | HTML files, selected through the template hierarchy | PHP files, selected through the same template hierarchy |
| Useful first step | Explore an existing block theme and its Site Editor on a test site | Follow the classic theme handbook and begin with the small starter structure |
This is a project decision aid, not a ranking. WordPress’s block theme documentation also recommends trying a block theme on a test site to see whether its editing model suits the project.
What files does a first theme need?
For a minimal block theme
WordPress needs style.css and templates/index.html to recognize a block theme, according to the Theme Handbook’s Theme Structure page. The Your First Theme lesson also walks through a minimal block-theme path that includes theme.json. These files are a starting point, not a complete production design: as the project grows, you may need templates, template parts, patterns, and global settings and styles.
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For a minimal classic theme
A classic theme can begin with style.css and index.php. The first-theme lesson presents that small starting path; the classic walkthrough then has you install the theme in a development environment and activate it for review. From there, the project may call for PHP templates, template tags, theme functions, and conditional tags.
The handbook notes that a no-code approach can work for simple themes, while work beyond what the interface supports requires code. That is a reminder to match the approach to the actual brief rather than adding complexity for its own sake.
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How does WordPress decide which template to use?
WordPress does not pick a template by guessing from a filename. It determines the kind of page being requested, checks candidate names in the template hierarchy, and uses the first matching file. If a more specific template is absent, it falls back to a more general one. The hierarchy applies to both theme types: classic themes use PHP template files, while block themes use HTML templates.
For example, if you add a template expecting it to control a page but WordPress selects a different matching file earlier in the hierarchy, the new file will not affect that request. Follow the hierarchy for the page type you are working on before adding more files. If no matching classic template is found, WordPress uses the theme’s index.php; the official Template Hierarchy documentation explains the resolution process.
A practical first-project workflow
- Clarify the brief. Decide whether the site owner needs to edit headers, footers, templates, and styles visually, and whether the project calls for classic PHP-based theme behavior. Use those requirements to choose a starting architecture.
- Study a maintained theme. For modern block-theme work, the Quick-Start Guide recommends exploring existing themes, particularly newer default themes. Inspect how their styles and templates fit together rather than mistaking the minimum example for a full theme.
- Start with the minimum structure and activate it locally. Use the starter files for the chosen theme type, install the theme in a development environment, and activate it so you can review what it does.
- Add templates only where the brief needs them. Trace the relevant page request through the template hierarchy. Add a more specific template when a page type needs a different structure; otherwise, let the fallback serve it.
- Expand around real editing and layout needs. Add template parts or patterns for block-theme structures that need them, and use global settings and styles where they serve the project. The Quick-Start Guide describes working in the Site Editor and exporting changes through WordPress or the optional first-party Create Block Theme plugin.
- Review from both sides. Check the relevant page types and confirm that the intended editing experience makes sense for the site owner. Treat this as project review, not as proof of compatibility beyond what you have actually checked.
What the first project teaches about the learning curve
The difficulty is less about a single technique than about connecting several decisions: theme architecture, required files, template resolution, and owner control. The official WordPress materials explain those structures, but they do not establish an average build time or a quantified difficulty level. A useful learning goal is therefore concrete: build a minimal theme, understand why WordPress selects each template, and make sure the chosen editing model fits the brief.
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