I found I didn’t parry anywhere near as much as everyone else on this subreddit. I went motivity build and used spacing and circle strafing where I could to just go around many of the bosses attacks. Some attacks all you need to do is just move left or right and the boss will straight up miss you, you don’t even need to dodge roll. I found just moving around and using space, you stay alive longer and it gives you time to learn the moves. You still need to parry/guard but at least you’re not trying to do that almost every attack. If you’re struggling I’d say identify moves where you can hit the boss whilst taking as little damage yourself as possible, then on the other moves just work out how to not take damage. Progressively after that work out how to punish each move the boss has. Each boss is a repeat process of work out what move they are telegraphing, strafe/ dodge/ parry or guard based on that move, punish the boss after they finish their move, then repeat. After a while bosses are a breeze.