Animation-Collider

Guys, I'm looking at the other games I wonder how do they ...

I.e. I had thought to add a raycasting during his fist for example and if that collide is like if you hit but this is not the right method. because if I had more enemies in front of the raycasting wouldn't make sense because it would only hurt the one in front of me and I hit with the RADIUS ... I need to understand how to manage the Hadron Collider! First I need to understand how to make a collision area that fits perfectly to my character and then during the animation to move not only the graphic part of the character but also the part of colliding! I hope that you will help me! PS: there are Italian books to buy on Unity3D?