How to customize the design of a WordPress blog

Open Appearance in the WordPress dashboard. If you see Editor, your active theme is a block theme and you can edit templates, headers, footers, navigation, colours, typography, and spacing with the Site Editor. If you see Customize, you are using a classic or hybrid theme and the available controls depend on that theme. WordPress documents these as the two main design routes.

Do not switch themes on a live site just to experiment. A theme change can alter menus, widget areas, templates, spacing, and the way featured images are displayed.

Decide what visitors should see first: your latest posts, a static landing page, or selected categories. Go to Settings > Reading to choose between latest posts and a static homepage, and set how many posts appear on the posts page.

Choose a small colour palette, one or two typefaces, a readable content width, and a consistent image ratio before changing the design. This prevents a common problem: making each page look different because individual blocks were styled separately.

For a block theme, go to Appearance > Editor. Open Styles to change site-wide colours, typography, layout, spacing, and block defaults. Open Templates to edit the home, single-post, archive, search, and other layouts. Changes to a header or footer template part apply wherever that part is used.

For a classic theme, go to Appearance > Customize. Use the sections provided by the theme to change the site identity, logo, colours, background, menus, widgets, homepage settings, and any available layout options. Click Publish only after checking the preview at desktop, tablet, and mobile widths. The drawback is that classic themes expose different controls, so you may not be able to change a layout without code or a different theme.

With a block theme, edit the Navigation section or select the Navigation block inside the header. You can reorder items, create submenus, change menu typography and colours, and adjust the mobile overlay. With a classic theme, use Appearance > Menus when it is available, then assign the menu to the theme’s display location. Block themes use the Navigation block instead of the older Menus screen.

To change the blog listing, edit the home or archive template and adjust the Query Loop or Post Template blocks. You can show or hide the featured image, author, date, categories, excerpt, and pagination. Check the result with short and long post titles because a layout that works with one-line titles can break with three-line titles.

Use the Customizer’s Additional CSS area for small visual changes on a classic theme, or the Site Editor’s custom CSS controls where your block theme provides them. Keep CSS limited to presentation changes such as spacing, borders, colours, and responsive adjustments. Save a copy of important CSS outside WordPress.

If you must edit theme files or add template changes, use a child theme rather than changing the parent theme directly. A child theme keeps customisations separate so parent-theme updates do not overwrite them, although complex changes can become difficult to maintain. Never use the built-in Theme File Editor on a live site for experimental code: a syntax error can make the site unusable until you repair the files another way.

Preview the homepage, a single post, a category archive, search results, and a 404 page. Test the navigation on a phone, check that text remains readable, confirm images are not cropped badly, and clear any caching layer before judging the final appearance. Keep the old theme or staging copy available until you have checked the main templates.

Fast way: use a blog theme built around the controls you need instead of recreating them with CSS and template edits. Krunk is a suitable option when you want responsive layouts, colour and typography controls, multiple post formats, and visual customisation without building the design yourself. Install the theme through Appearance > Themes, activate it, then review its customisation settings before importing or recreating your menus and widgets.