To add a table of contents in Microsoft Word, apply Heading 1, 2, and 3 styles to your section titles, click where you want the list, then go to…
Before you insert anything, mark up your structure using Word's heading styles on the Home tab in the Styles group:
On screen, each entry is a hyperlink.
Here's the part manual lists can never match.
The default style works, but you'll often want to fine-tune it.
Read the complete breakdown, fixes and what happens next.