The Table of Contents plugin can be used to add a table of contents that is generated from the headings you’ve used within a page or post. It can be configured to either insert itself automatically, to wait for a certain number of headlines to insert itself, or to only do so when called with a short code.
Creator’s site: https://www.relevanssi.com/user-manual/
The default WordPress search assumes both that the site will be made of blog posts and that the most recent posts are by definition the most relevant ones.
Description: “Query and display posts, pages in awesome layouts (grid, scrollable list, collapsible list) easier than ever, without coding!”
Plugin creator site: https://wordpress.org/plugins/content-views-query-and-display-post-page/
Examples: In this page there are three layouts of every post marked in the “Site management” category — grid, scrollable list, and collapsible list.