A clickable table of contents is one such feature in Google Docs ... for instance, if you export it as a PDF or EPUB document. You can even create a table of contents for your Google Slides.

One of these is the ability to easily add links to PDF pages, which can be used to create clickable indexes and tables of contents.

A table of contents is another important clickable list to consider. It allows the user to jump to a topic with a single click.