Our pricing page is a pillar; the posts on what a website costs, what maintenance costs and how to compare agencies are its cluster. Each post links up to the pillar and sideways to siblings, and the pillar links to all of them.
The shape tells search engines the site has depth on the subject rather than one page mentioning it. It is also how a reader moves from a specific question to the decision, which is where the enquiry happens.
A cluster is also the fastest way to spot gaps: the sub topic with no post is the one competitors will answer instead.