I'd like to create this post to discuss about the player's mistake and their skills. Please, if you know, tell me why a players commit some mistakes and what to do to decrease these mistakes and how to increase their performance. What are the key skills for each position.

Do you mean errors? They're more likely to happen to younger players, and those with the error prone trait.

Hahaha...why should we discuss this topics in open chat groups?:))))