Stasis is great for freezing your on units. when your unit is being nuke or when too many units attack you u should freeze and bring more units to the spot. u should have many arbiters and freeze their units too. this will make u a better player and gain respect from other players and many will copy your style.

Scouting will reveal any mistakes by your opponent. Scouting is especially profitable when playing Terran, because if you are lucky enough to find an opponent bereft of detectors, you can kill him easily with a handful of Dark Templars.
When on the defensive, use shield batteries to your advantage. It greatly increases your Zealots life Expectancy.
Against far greater numbers of Zerglings, Zealots can prevail if they only have to fight one Zergling each at at time. By positioning your Zealots shoulder to shoulder at a choke point (make sure the choke point is completely sealed off and the Zealots are on hold position), you can slaughter Zerglings that would otherwise overwhelm you