Hi, I was wondering, when I am in a LD, and a fight someone ( or learn some fighting technique), if after (in the real life) I can reproduce these techniques.
If is it not clear, my question is : a LD can be like a training ?
Welcome to LD4all, Flash-Dream 
If you know a technique you can try to refine it inside your dream. In fact, a lot of RL skills can be refined in a dream. We have a person here who practices golf in his dreams and it actually helps his game.
It is possible to learn a new technique, bu the question is whether or not that technique is possible and/or practical in RL. I know some of the fighting moves I’ve done could never be used in RL because they would leave me too open or simply couldn’t be done due to physics. But, if you do something that can be done, why not try it out in RL? The best way to answer your question is to try it and see what happens.
Thank’s 