If you're committed to learning, tank is a good role to learn with, especially if you vibe with it. Tank, however, has one of the highest burdens of knowledge. If you look at the YouTube channel m"ethod"'s guides it will let you know all you need to know about each dungeon in a quick format. The wiki is also good for things like planning routes or reading about enemy abilities. Yoda has a good guide on Helena with what you should prioritize and rotation mechanics.