Help my friend with the US tanks

As the title says, it's about my friend with whom I play regularly, I'm a German Main and have arrived on BR 6 RB since today and I'm very satisfied with the tanks so far, although I still have to get used to the transition from 5.3/ 5.7 to 6 (for whatever reason)

But that's not the point. My friend plays USA, he said he can't cope with the Germans turret traverse. All right, he says he can't penetrate anything with the Shermans and if then he needs several shots to eliminate an enemy tank, but usually it doesn't get so far because he flies instantly into the air as soon as he gets against fire. He has the 76mm cannon and he says he uses the m62 rounds and shoots at weakspots. I can't help him and ask you why it is or what else he can do or what he's doing wrong. He is extremely frustrated.

I can only say that I can confirm that I can take out the (most) shermans very easily (what a miracle) and also rather rarely be taken out by one, as long as I have cleverly bent. The only thing that really causes problems from time to time are the successors of the Shermans and the IS series. When it comes to the stats, the pen of the shermans seems really poor in comparison and from my own experience I find the armor view tricky because I had to find out myself that even if it says that the shot would have to go through (!) In practice, 90% is not the case in some places.

Thanks in advance and sorry for my poor English !