About the shooting posture and some minor problems

Three right angles. At the moment of pitching, the palm bends back at right angles to the arm, the forearm at right angles to the arm, and the arm at right angles to the trunk. While the other hand assists the ball. When throwing the ball, the big arm should drive the small arm. After the ball is thrown, the arm should extend with the trajectory of the ball and the palm should be pressed down. . Personally, I think Kobe's shooting is the most standard. You can find some teaching videos to watch. .

There should be no problem with your classmate's defense. Maybe you are not strong enough. . As long as he doesn't block it with the same hand, but his body and trunk are pointing at you, it's not a foul.