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Terran Defense

This is probably the most well known (and dare I say it, the most effective) Terran defense strategy. First, build a standard defense. This consists of Bunkers blocking the path through the choke point. From then on it depends. First scout the base, if he is making mass Zerglings or Zealots, fill the Bunkers with two Marines and two Firebats each. If not fill the Bunkers with marines with upgraded Range and at least one weapon upgrade. Then make four Siege Tanks and research Siege Mode. Siege them as close to the bunkers as you can. Build a Dropship when you get access to it and drop an SCV in front of the bunkers. Then, build Supply Depots to protect from melee attackers. The Siege Tanks will decimate ranged attackers. If your a stickler for defense and you control a couple of expansions then you may decide to build a mine field near your base too. I don't do that personally, one reason because I hate vultures; They control far too akward for me. After all of this you can now do your strategy safely. Also, remember to have a filled Bunker or two and some Missile Turrets in the back in case they drop.