You can create bookmarks by selecting text on a page and making it a bookmark, or by adding an untitled bookmark and then setting and naming it in the Bookmarks pane.
When adding bookmarks that link to another part of the same document, you’re not limited to just linking to a page number, you can have precise control over the exact view a user experiences-for example, a bookmark could move a user to another page and zoom in to a small area of the page. You set this by editing the action property of the bookmark.
Note: A bookmark added this way is set by default to link to the current page being viewed. To use a different kind of action, see the Edit a Bookmark chapter of this guide.