to sum it all up:
-you get a bunch of points for capturing the hardpoint.
-getting kills while on the hardpoint adds up
-using UAV / CounterUAV / Guardian racks up a lot of points
-going off of the hardpoint when you see that it is contested will give you the capture points once you kill the enemy on the hardpoint
-EMP grenades go through walls and have a huge radius
-destroying equipment and EMP assists are +50 each
-Prestiging guns ASAP will get you points for challenges
-Don't kill-whore
-always play objectively