PDF documents may contain bookmarks that describe the document's structure like a table of contents and that enable jumping to various places in the document.
To see the bookmarks in the current document, open the Sidebar, and click Bookmarks on the left edge of the window. Alternatively, you can choose View Sidebar Bookmarks on the menu.
Click the bookmark in the tree view to go directly to the page indicated by the bookmark.
Clickable Links in PDF Documents