Bookmark Suggestion

Sometimes I mentally bookmark certain projects that I want to revisit or certain concepts that I want to tackle again, but it is sometimes difficult to do so with the number of mental bookmarks I have! A bookmark feature would allow users to easily save and access projects or concepts that they want to revisit in the future. Similar to highlighting or using sticky notes in a textbook, this feature would provide a convenient way for users to keep track of what they want to review. Just a thought.