A website sidebar is one of those things many people either ignore completely or overload with too many widgets. I see both problems regularly on WordPress websites — a sidebar filled with calendars, tag clouds, banners, social feeds, and whatever plugin happened to add a widget, or no sidebar at all because nobody thought about whether it could help visitors navigate.
In most sites I build, the sidebar works best when it has a specific purpose — help visitors find related content, take one clear action, or move through the site more efficiently. Used properly, it improves usability and page views. Used as a dumping ground, or placed on a theme that doesn’t even support one the way you’d expect, it does the opposite.
Quick Answer
A WordPress sidebar is an area beside your main content where you place widgets — navigation, recent posts, a search bar, calls to action, or a signup form. On a classic theme, build it under Appearance → Widgets. On a block theme, there is no Widgets screen for this at all — you build a Sidebar template part in Appearance → Editor instead, since block themes replaced widget areas with template parts entirely. The best sidebars are simple, useful, and relevant to the page content, not a pile of everything the theme happens to offer.
Why Sidebars Matter — and Where the Common Advice Gets It Wrong
A sidebar gives visitors another way to navigate your website without returning to the main menu. On content-heavy websites it helps visitors discover additional articles, categories, or important pages. On business websites, it can support lead generation with newsletter forms, booking buttons, or contact links. It also strengthens internal linking — a well-structured sidebar can help search engines discover important pages more efficiently, provided the links are genuinely useful to a visitor rather than a mechanical list stuffed in for crawl-path reasons.
Here’s the part a lot of sidebar advice gets backwards: it’s common to see the claim that a right-hand sidebar automatically performs better because people read left to right. Nielsen Norman Group’s eye-tracking research — spanning three decades of studies through 2024 — actually found the opposite pattern for anything that reads as an ad. Users build a mental schema for what an advertisement looks like (specific dimensions, right-rail placement, a bold call-to-action over an image), and once that schema is triggered, they scan right past it — including genuine content that happens to sit in that same visual position. This is called banner blindness, and it means a right sidebar full of banner-styled promotions or stock-photo CTAs gets ignored at roughly the same rate as an actual ad would. Plain text links, a genuine search box, or a simple “related articles” list don’t trigger the same schema and do get used — so the fix isn’t necessarily moving the sidebar to the left, it’s making sure what’s in it doesn’t visually read as advertising.
Not every website needs a sidebar on every page. A clean full-width layout often works better for landing pages or conversion-focused pages, where the goal is one action, not several competing ones.
Setting Up a Sidebar: Classic Themes vs Block Themes
The exact process depends heavily on which kind of theme you’re running, and this is where a lot of older sidebar guides go stale without saying so.
Classic Themes: Appearance → Widgets
Most classic WordPress themes already include sidebar areas. Go to Appearance → Widgets and you’ll usually see named areas such as Main Sidebar, Blog Sidebar, Footer Sidebar, or Shop Sidebar, depending on the theme. Drag widgets into the area you want. If no sidebar areas appear here, the theme is likely built full-width by default.
Block Themes: There Is No Widgets Screen
This is the genuinely important distinction: block themes (Twenty Twenty-Four and most current default themes) don’t have widget areas at all — the concept was replaced entirely by template parts. “Appearance → Widgets” either doesn’t exist or shows an empty legacy screen on a pure block theme. To add a sidebar, go to Appearance → Editor, create or open a Sidebar template part, add the blocks you want inside it (Search, Latest Posts, Categories, Buttons), and then include that template part in your single-post or page template via the Template Part block. It’s a genuinely different workflow, not just a renamed menu — treat any guide that says “just go to Widgets” on a block theme as written for a different era of WordPress.
Start With a Few Elements, Not Everything at Once
Whichever method applies to your theme, most websites only need a handful of sidebar elements. I usually recommend starting with a search bar, recent posts, categories, one call-to-action button, and a newsletter signup — then stopping there. A crowded sidebar reduces usability regardless of which system built it.
Useful Sidebar Elements, and What Each One Is Actually For
A search bar earns its place on blog-heavy sites, tutorials, or large archives, where a visitor arriving on one article often wants to jump straight to another topic rather than browse. Recent posts keeps people exploring — I usually cap this at around five posts so the list doesn’t sprawl and start competing with the main content. Categories work well once your content is genuinely organised into sections; on a site like this one, showing WordPress Setup, SEO, Website Structure, Ecommerce, and Website Marketing as sidebar categories helps a reader move through related content without hunting for it in a mega-menu.
An email signup form works especially well on blog posts, where the reader is already engaged with the content and more receptive than they’d be on a first-visit homepage. A call-to-action button pointed at a contact page, booking page, or resource library should stay a simple button rather than an over-designed graphic — the more it looks like a banner ad, the more it risks triggering the banner-blindness pattern covered above.
Controlling Sidebar Placement
Many WordPress themes let you choose between a right sidebar, left sidebar, no sidebar, or full-width layout, usually under Appearance → Customize on a classic theme, or inside page-level layout settings on a block theme. Given the banner-blindness research above, I’d frame the choice less as “right is always best” and more as: put genuinely useful, non-ad-styled content in whichever position your theme handles cleanly, and don’t assume position alone fixes an engagement problem that’s really about what’s inside the sidebar.
When to Use a Sidebar, and When Not To
Sidebars work best on blog posts, tutorial sites, news sites, resource-heavy sites, and documentation-style content — anywhere a reader might reasonably want to keep exploring after finishing the current page. They’re less useful on landing pages, sales pages, checkout pages, and minimal portfolio pages, where removing distractions and focusing on one action tends to improve results. Many sites reasonably run both: a sidebar on blog content, full-width on conversion pages.
One of the most useful elements to add to a sidebar is a search bar — it lets visitors find content across your entire site without navigating away. For a step-by-step walkthrough on setting that up, see the guide to adding a search bar to a WordPress website.
Common Sidebar Mistakes
Adding too many ads. Excessive ads reduce trust and clutter the page — and per the research above, may simply get scanned past unread once a visitor’s brain files the whole sidebar as “ad space.”
Using irrelevant widgets. A music widget or social feed rarely helps a visitor on a practical tutorial site. Match the widget to the site’s actual purpose, not to what’s available.
Ignoring page speed. Some sidebar widgets load external scripts that slow the whole page down. Google recommends reducing unnecessary third-party scripts for exactly this reason — see web.dev’s guide on third-party JavaScript. Social feeds, chat widgets, weather widgets, and third-party ad systems are the usual culprits. When I review slow WordPress sites, sidebar widgets are frequently part of the problem.
Duplicating the main navigation. The sidebar should complement the main menu, not repeat it entirely — focus it on related content or a secondary action instead.
Following a widget-based tutorial on a block theme. As covered above, “go to Appearance → Widgets” is dead advice on a pure block theme — check which type of theme you’re actually running before following any sidebar tutorial, this one included.
Sidebar vs Full-Width Layouts
A full-width layout works better when you want visitors focused on one action — landing pages, checkout pages, webinar registration pages, sales funnels. A sidebar layout works better for informational content where visitors may genuinely want additional navigation options. Many modern WordPress sites reasonably run both, choosing per page type rather than picking one layout for the entire site.
Sidebar links can also help strengthen important sections of your website when combined with a proper internal linking strategy for WordPress — linking to cornerstone guides or category pages from the sidebar improves content discovery for visitors and search engines alike, provided each link is chosen because it’s genuinely relevant to the current page.
Conclusion
A good WordPress sidebar helps visitors navigate more easily without creating distractions or, worse, getting scanned past entirely because it visually reads as an ad. The best sidebars stay simple, use content that doesn’t trigger banner blindness, and are built the right way for your specific theme — widgets on a classic theme, a template part on a block theme. For most websites, a clean sidebar with a few carefully chosen, genuinely useful elements outperforms both a crowded layout and no sidebar at all.
Etienne Basson works with website systems, SEO-driven site architecture, and technical implementation. He writes practical guides on building, structuring, and optimizing websites for long-term growth.