In King of The Hill, you will need to control one weapon point on whichever map you play on. This spot will not change until one team gets 120 points for the round. To score points you need a minimum of one person on your team in the hill, wheter he/she is crawling or stunned. As soon as an enemy enters the hill the hill will break and you will need to recapture it by clearing out the enemy. You need to win best out of three, then rinse and repeat until you have done this three times.
Hope this helps!