I had a similar experience not long ago and was also confused at the beginning. After checking a few options, I found Aviatrix and it was actually easier to follow. The explanations there are quite straightforward and focus on how the game really works. I also noticed they mention demo mode, which is helpful if you want to practice first. They even go over some basic ideas without making it too complicated. It felt more useful compared to other sites I tried. Might be a good place to start if you want clarity.