A bookmark in Word is just like a bookmark that you would use to mark your place in a novel. You use bookmarks to mark a location in a document so that you can quickly find and jump back to it.
You can select text, select a picture, or simply place the cursor at a specific location.
Check the Insert tab.
Expand the Links group, if necessary.
Click the Bookmark button.
The Bookmark dialog box opens.
Type the name of the bookmark.
Click Add.
The bookmark is created and can be used to jump directly to the selected spot in the document.
Bookmark names can be from 1 to 40 characters in length, must begin with a letter, and can only contain numbers, letters, or the underscore character — no spaces.