🏛Topical Depth

Topical depth for AEO: cover a subject thoroughly and AI engines will trust you on it.

AI engines don't just cite individual pages. They cite sources they've decided are authoritative on a topic. Topical depth is about building the kind of comprehensive, well-linked content coverage that earns you that authority. These 7 free AEO guides show you how to build topic clusters, fill content gaps, and create the internal structure that signals expertise.

7 guides in this topic Around 60 minutes total reading Full implementation guides: PRO+ and AGENCY

7 guides covering topical depth for AEO from topic authority through to publishing frequency. Start with Guide 1 if you're new to AEO. Jump straight to any guide if you know what you're looking for.

Topic depth

All Topical Depth AEO guides

7 guides

Guide 1 of 7 Start here

What is topical authority and why does AI reward it?

The foundation guide. What topical authority means in AEO, how AI engines measure it, and why being the most thorough source on a subject beats being the most optimised page.

9 min read →

Guide 2 of 7 PRO+

How to build a topic cluster that AI engines love

Topic clusters give AI engines a clear map of your expertise. Here's how to structure pillar content and supporting articles so your authority signals compound across the cluster.

9 min read →

Guide 3 of 7 PRO+

How to find the content gaps that are hurting your AEO score

Every unanswered question in your topic area is a gap a competitor can fill. Here's how to find yours and prioritise which ones to close first for maximum AEO impact.

8 min read →

Guide 4 of 7 PRO+

Why internal linking matters more for AEO than you think

Internal links tell AI engines how your content is connected and which pages carry the most authority. Here's how to build an internal linking structure that strengthens your AEO signals.

7 min read →

Guide 5 of 7 PRO+

How to write supporting articles that strengthen your pillar content

Supporting articles do more than add content volume. Done right, they fill specific question gaps and pass authority back to your pillar pages. Here's how to write them for AEO.

7 min read →

Guide 6 of 7 PRO+

What is semantic search and how does it affect AEO?

AI engines understand meaning, not just keywords. Semantic search is the reason topical depth matters so much for AEO. Here's how it works and how to write for it.

8 min read →

Guide 7 of 7 PRO+

How often should you publish content for AEO?

Publishing frequency affects freshness signals, but quality always beats quantity in AEO. Here's how to think about a publishing schedule that actually moves your citation potential.

6 min read →

Did you know Caijo could do this...

Caijo maps your site's topical coverage and shows you exactly which content gaps are costing you citations.

Topical authority gaps are invisible until you scan for them. CaijoBot analyses the topic coverage across your crawled pages, identifies questions in your subject area that you haven't answered, flags pillar pages that are missing supporting content, and surfaces internal linking gaps that are preventing authority from flowing through your cluster. Free users see the topical depth score. PRO+ and AGENCY users get the full content gap list with specific recommendations, plus CiteReady passages to help fill the most impactful gaps immediately.

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Frequently asked questions about topical depth and AEO

What is topical authority and why does it matter for AEO?

Topical authority is the degree to which AI engines consider your site a reliable, comprehensive source on a given subject. It's built by covering a topic thoroughly across multiple interconnected pages, not by optimising a single page for a target keyword. AI engines reward topical authority with higher citation rates because comprehensive coverage signals that you genuinely understand the subject rather than having produced one well-structured page about it. The more completely you cover a topic area, the more confidently AI engines will cite you when a question in that area comes up.

What is a topic cluster in AEO?

A topic cluster is a group of related pages organised around a central pillar piece. The pillar page covers a broad topic comprehensively, and a set of supporting articles cover specific sub-topics in depth. Each supporting article links back to the pillar, and the pillar links out to each supporting article. This structure tells AI engines that your site has deep, interconnected expertise on the subject rather than isolated pages. For AEO, well-structured topic clusters significantly improve the likelihood of being cited across a range of related questions.

How do I find content gaps for AEO?

Start by listing every question someone in your target audience might ask about your subject area, then check which ones your site doesn't currently answer well. Tools like Caijo's Citation Gap analysis (PRO+) surface these gaps directly by analysing what your Cornerstone Pages don't cover. You can also manually review competitor content, use People Also Ask sections in Google search results, and look at the questions your existing content is almost but not quite answering. Prioritise gaps where you have genuine expertise and where a strong answer doesn't already exist from a well-established source.

How does internal linking affect AEO?

Internal links serve two functions for AEO. First, they signal to AI engines how your content is connected and which pages are most important within your topic area: pages with more internal links pointing to them are treated as higher authority. Second, they help crawlers navigate your topic cluster efficiently, ensuring every page in the cluster gets discovered and indexed. For AEO specifically, make sure your pillar pages have strong internal links from supporting articles, and that every supporting article links back to the pillar. Orphaned pages with no internal links pointing to them are essentially invisible to the authority flow.

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