My buddy plays tau, and he's pretty new to the game. Unfortunately, his computer's messed up and he couldn't make an account. Therefore, he asked me to ask you all
"What tactics are there for tau?"
Specifically though, he mentioned vehicles. Should he take piranhas? A Sky Ray? Kroot?
Also, he has no idea what to do with his vespids. He's playing mostly against Orks, Marines, Necrons and the Imperial Guard. His playstyle is stand and shoot.