Do NOT stick to firefights you are not going to win, you'll only bleed while your opponent snowballs, you'll get this sector later.
Funny but our pro Katitof has given the best "pro" tip so far ^^
Very hard to learn, but the most important one. You don't need fast micro necesarilly, if you know which fights you will win and which ones you wont and turn the fights to your advantage or leave the fight.