The Quantum Library is the place where you can find videos explaining quantum principles. When watching a lecture or taking a quiz, you can always come back to this library to get a better understanding of the follow topics:
entanglement - different ways of entanglement - teleportation - measurement - measurement in superposition - repeaters
The video library is a collection of videos that form the background information for this course. Like a regular library, these videos are here for your reference. These same videos are repeated and used in the course at different moments where they are required.
However, if you would like to "binge watch" all the of the content at once, or treat it like a snack-bar, please feel free to watch and use these as you wish.