Really a question of where you are at and what your immediate needs are. I may feel like I need to learn more about opening theory but the stronger players at my clubs feel basics like my king and pawn endgames needs attention first.
Post a few losing games of yours, get some critiques from a few strong players (chess.com is swarming with them!) as to what is ailing you and you'll be able to come up with a list of priorities ... then you'll be able to create a learning course of sorts with these videos (really good ones, I have to say!)
I am just getting back into chess and have so much to learn. I love the great videos and Chess Mentor. Is there a suggested series of videos/CM topics on the site or has someone posted such a suggestion to generally improve one's game?