2 types armor piercing [no explosive -try and hit something] and he which makes fire. stick with ap in tank battle. check all this again after update tho.
a bit tip for u new guys. there's lots of really important button binds and wep stuff in this game. sort it out and fill in the important blank ones. learn to use ironsights , crouch lots. in tanks use mouse scroll wheel and 1,2,3 to change spots / views in tank
it's a hard game there's lots to learn, but this site is too big to find anything and you're in the wrong thread. go and find a game and ask someone.