This skill is almost impossible to learn.
The skill is automatically in use.
Almost any creature can pick up an axe and start chopping wood, but using these things in combat is a whole lot different matter indeed. It doesn't make any good to blindly swing your axes around and wait if by luck you get some damage done as your opponents are surely proficient in skills such as dodge and parry. Just like with any other type of weapons, practising and experience are required to be efficient in combat.