whats a game that you got significantly far into, only to realize you were doing something wrong or missing a key feature/ability altogether?

I didn't realize metal gear rising had a block/parry mechanic. The tutorial talks about countering enemy blows with your own barrage of attacks so I figured I just had to stagger them and steal health regularly. Monsoon is the first fight with no minions to heal off of, so I got stuck and finally checked online.