level 80 in world of warcraft? Like i want to know what kind of gear i should need on in dungeons because before i just needed all the plate and after a while i would get yelled at by the other players and i didnt understand why. and could you explain any other tips you have for me

As a protadin you want to look for plate gear that gives stamina, strength, and dodge rating. Until you reach level 85 the gear you find will be much like dps gear, aside from some gear that gives dodge rating, additional armor, and sometimes mastery. Generally speaking, until 85 you want a lot of stamina and strength. This will increase your health to take more hits, and increase the amount of damage you absorb with your shield as well as increase the amount of threat you generate.
Also don't be afraid to ask your group if it would work well for you. The community is a great tool to use, and you should use them. More often than not they can help you decide whether or not the piece should replace the item you are already wearing.