Project Classes Organization - General Question

Recently I've read an article in Unity webpage where users(I think) explained in a separate lesson what as minimum your project should contain. This was regarding the classes. They've stated(as much as I remember) that it should contain: Game Manager class, Player movement class and a few more which I cant remember. There was also explanation about how to separate each action (shooting, player movement, etc) in different classes.

This might look stupid but I can't find that page anymore and I would really apreciate if someone could give me the link for it(if it still exists). I've searched for that page for 2 hours now and I still can't find it. I will really appreciate it if someone gives me the link. (I accidentally deleted my browser history QQ)