If people stood to the side at the start of a dungeon or just before a fight and asked if everyone/anyone knows what to do then a lot of silly ragequits could be avoided. I joined a Darkhold run for the first time the other day, and as always I joined in progress. My party informed me that I was the 3rd tank to join them, the previous 2 ragequit during the first 2 bosses. When I entered we had 40mins to do the remainder of the dungeon and I had no idea what to do (aside from a brief text guide I skimmed over beforehand).
We had one shot at the final boss and we did it with 1:26 left on the clock, the amount of joy we shared was immense.

To any fellow tanks out there, please don't ragequit like those did before I went in to that dungeon. Communication is key to success, and be confident in the face of danger!

To anyone I may party with in the years to come, if I'm doing something wrong or not optimal, please let me know in a kindly manner and I'll be more than happy to change my methods to make it smoother for us all.