So, am I the only one who didn't know that you can highlight a link, press "control K", and make it a hyperlink?  So, if I want to link this https://www.youtube.com/watch?v=zz6v6OfoQvs, I just do control k and, voila- https://www.youtube.com/watch?v=zz6v6OfoQvs  (assuming it will publish in the form I see now.  it turned blue, which is what you are looking for).

Also:  Quizizz and ED Puzzle now integrate seamlessly with Google Classroom.  Fool around with them yourself, or stop by and I'll give you a demo.