To return to the Index, click on the Return button in the lower right hand corner
This will also allow you to jump to the Adobe Illustrator menus.
Remember, to search for any topic, just pick Find... from the Go menu, or type command-F, then type the name of the topic you want to find, and press Enter. Keep pressing Enter to find each occurrence.
Also, remember that words with asterisks (*) are linked to notes or other cards. Click on them to find the note or link.