As far as dungeons goes it's pretty simple. The party will move to your tempo for the most part. It's actually easy in the beginning it becomes challenging as the game plays on. Bosses harder to tank and you have to learn how to do the tango with certain bosses or when to pop cool downs to stay alive and support your healer in keeping you alive. Don't think to hard on it. Look up some vids if you need a for sure answer or ideas. Tanking doesn't become complicated until you start breaking in on how to stance dance and using cool downs. People have difficulties with that but it takes experience and trail and error to learn. People will talk trash and have their own words. Don't let it get too you. Do your best to complete dungeon or trail also remember it's a game not worth it if you're not enjoying yourself. Happy tanking!