Is your bookmark bar full and your bookmark lists a mile long? Don’t worry, bookmarking things on here won’t add to the problem. You can bookmark directly in the community by clicking on the bookmark icon, directly to the left of the Reply button:

To get back to your bookmarks, click on your avatar in the upper right and then click on the bookmark icon in that menu.

(Sorry @dimforest but you can only bookmark posts and topics, not your badge page).