^^^ what he said, the key thing is FOCUS first. Then branch out after you've reached mastery of at least 1 combat style you like. You gain xp by using the skill in any context, so you don't have to take training to level up the skill, just using it levels it up. Actually I should say, level up anything you please, but only spend perk points on your preferred fighting method. Perks not xp is the key. If you level up lockpicking through a trainer but then spend/save the perk points for archery that's viable, although don't do too much of that or you might be unbalanced with combat. But using a bow just to do a quick one hit, and then switching to sword and shield will level up all three, Archery/Sword/Blocking, but if you prefer Sword/Blocking even if the xp from Archery levels you, putting perk points into Sword/Blocking is the best move. If that makes sense.