Quote:Adding a table of contents to your document is a useful way to show readers each topic/chapter listed inside your file. When you create a table of contents in Google Docs, it automatically generates one and adds links that jump to each section they reference when clicked, allowing for quick access to specific parts of your document.

How to Create a Table of Contents in Google Docs

Place the insertion point in your document where you want the table of contents to go. Typically, tables of content appear after the initial title but before the introduction or body of your document.

Click “Insert,” point to “Table of Contents,” and then click on either of the two options provided. The first option is a plain-text table of contents with numbers on the right side. The second option doesn’t use page numbers, but instead inserts hyperlinks that jump to the noted section. The first is intended for documents you’ll print, the second for documents to be viewed online.

Full reading: https://www.howtogeek.com/398747/how-to-create-a-table-of-contents-in-google-docs/