Hi Pierre and welcome.

I am about 5weeks into the fundamentals part one myself.

I have taken the same approach as you, rather than try to "master" every element, once I am reasonably competent have moved to next lesson. Also like you, I have practiced each day to ensure I keep improving those earlier lessons

So far it's proved ok and I have not had to go back to any lessons.

I find this approach helps me feel like I am making steady progress, which is a good positive motivator.

Also, some of the later stuff has helped me improve small details that make the earlier stuff a little easier. For examp,e, practicing the simpie chord changes has helped my spider finger exercises no end.