Protoss Defense

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Early Defense
Be ready to get rushed. Don't stop building probes and never stop building zealots. Set up a couple photon cannons around your base, they'll detect cloaked units and sometimes will kill off your enemy's attack.

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Expand
Start expanding as soon as you get your Forge and Cybernetics Core. You should have enough minerals for a Nexus and more minerals and gas will only help you. Don't make your expansions too far off of your base, make them as close as you can and don't forget to defend your expansions.