i read in a several post this word (community leadership) and i don’t know what that mean and if that can affect my ranking
Hello, It will not affect your ranking.
It is a term that has a meaning that is not clearly defined.
In general it means always acting as a true professional when you communicate and always be the best you can be when on the website, as an example to others. It does not seem to necessarily mean having an active part on the forum, although that is certainly one way to show community leadership.