Ability to Star/Favourite videos or make playlists

Hi

Sometimes there are things that I want to star/favourite so I can go back and watch them again later, or I want to build up a playlist of relevant videos for a certain topic leading up to a test. At the moment I just have a bunch of bookmark folders on my browser for my own computer but since I use lots of different devices and sometimes I'm using the android app or sometimes I'm on the computer in the library, it would be neat if this were an option on the videos that saved it to my profile so when I switch device I can just get them from my profile page.