That could be what he means by git gud.
Learn the basic attack patterns and how to dodge. Don’t skip bosses. You’ll learn the mechanics and by extension you’ll “git gud”.
People that bitch about people saying “git gud” are the toxic ones. Usually it’s someone who gets angry because they can’t beat a boss. If you’re good you don’t cry if someone says “git gud”.
Kingdom Come Deliverance 2. 1500 hours in that game is worth it.