Facebook Timeline is where to store all the status, images, videos,...of a person. When you enter someone's Timeline, you can find the information that he shared and allows you to be able to see. Other users can write on your Timeline or comment on your post. If you do not want that to happen, you can stop someone post on the Timeline.
How to go to your Timeline?
You need login to Facebook first, then click your name on left Home button:
Or you can click here and go to Timeline quickly.
How to go to someone's Timeline?
Click their name and go to their Timeline:
Or you can search their name on Search Bar.