Here's a strong vote for sticking with Christopher and the Fundamentals course. And IMO, you should have each lesson down pretty well 'cause the next ones build on what you learned and your hands' newfound skills. For the same reason, I believe you should go through the Fundamental lessons in the order they're presented.

But as your skills grow, e.g., around the time you get open chords down, there's nothing wrong with bouncing around to some 'easy' songs or adding other stuff to your practice sessions like chord progressions.

Others may suggest a different approach but I think we all agree that the key is to keep growing your skills and keep having fun.

And welcome!!