I was about to start a new thread with the same title when I came across this one, so I'm just going to heap some more praise on ScoreClub.
While I was immersed in classical piano as a child, in rock guitar as a teenager, and in jazz/art rock as a young adult, I've never gone to university to learn music theory. This is despite becoming a reasonably successful studio musician and arranger (by obsessively reading, analyzing and listening to mentors).
Each time I tried formal music theory, over many decades, my eyes immediately glazed over with total boredom and I would become comatose. Until now....
Covid lockdown has re-ignited my determination to conquer this mountain. So, armed with a number of printed and digital formal music composition and theory texts, I enrolled in ScoreClub as part of a multi-pronged attack. Well, ScoreClub has been an evangelical experience for me, it holds my interest at all times, and I am SO appreciative of Alain's approach.
If anyone is in doubt, just do it!