As you might expect, the Protoss differ in several ways from both the Terrans and the Zerg. They're the most technologically advanced race, but also pay the greatest base cost per unit. By the time you're playing as the Protoss, you'll have finished all the Zerg and Terran missions and should have a solid grip on Starcraft strategy. Nevertheless, there are a few things you should know before you venture fourth.
Protoss units enter each scenario through a Probe-opened Warp Rift. The cool thing about Probes is they need only begin the process of opening the rift; they don't have to wait for the structure to appear. This way you can have a single Probe move around opening Warp Rifts while your other Probes happily harvest minerals and gas.
Playing as the Zerg may leave you with a throwaway attitude toward your units. Protoss units are considerably more expensive than the Zerg's, however, so never treat them as if they're easy to replace. Novice Protoss players have lost many a game by running out of resources trying to create overwhelming numbers. The key to Protoss victory lies in using superior technology rather thean brute force.
Another Protoss feature worth mentioning: They all have shields (which I hate personnally I hate cause I am a Terran fan) that absorb punishment before a unit takes any hits. Actual damage can't be repaired, but the shields always regenerate. This means a Protoss unit can have one hit point left and, if its shields have regenerated, it can still be a threat. A Terran EMP blast (layin the smack down) can defeat your shields in one fell swoop, but otherwise they must be taken out one hit at a time.
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