I am looking for a gaming animé ou manga in which the mc enters a sword fighting / magic environment and has to train and become the best. examples of what i am looking for are in the details ou background information.

Log horizon might be a good one! They actually go into the gameplay of an MMORPG and toi get to see the strategies and tactics used(i think.. not that I play ^^''). It's a bit like sao(ONLY since in both plots the characters are trapped in the game) but after that the focuses are totally different! I highly recommend it! Unless you've seen it already then nvm. hahahaha

psttttt don't tell anyone but...I prefer log horizon to sao o.o