Terran Defense

6-17-98
Defense First! - by SnOwBrDr69
Always get a good defense before concentrating on your offense. Many battle.net ladder players like to rush out a bunch of units without taking any regard to the base defense. So when their men go up against your base defense, they'll be taken out (at least if you're Terran). After your base defense is set up start working on an attack. Quickly build up and army. Then attack. Of course it's much more complicated that this but that is the basic way to play multi player games, with humans.

6-17-98
Build Order - by Derek Jauregui
Here is a building strategy on how to set up your forces for Terrans as quickly as possible.
-Build 2 or 3 more SCVs
-Use the last one you build to build a Barracks
-Continuously SCVs slowly while the Barracks is being built.
-Before the Barracks finishes make sure you have 200 minerals
-With the 200 minerals build two Supply Depots at once with the SCV you built the Barracks with and one of the spares.
-After the 2 Depots are done use one SCV to build a few Bunkers and use the other to build a refinery.
-Build a Factory ASAP, and build an Armory while the first Factory is being built
-After the Armory is done build a second Factory.
-Build 2 to 4 more depots 2 at a time then build a Starport.
-Build the Science Facility right after the Starport.

Tips:
Set up 2 bunkers one in front of the other in the front bunker: 3 Firebats 1 Ghost/Marine, in the second bunker 4 Marines/Ghosts this trick works the best against the Zerglings or the Zealots one of  the best rush defenses. Larger Defensive setups work better if at least half the defense is mobile. Take for instance A bunker with a Siege Tank in Siege Mode right next to it.
The best setup for a single part of your defense is: 1 or 2 Siege Tanks in Siege Mode, Bunker with 4 Marines/Ghosts, Missile Turret, 1 or 2 Goliaths, Science Vessel behind the defenses.

Keeping your defenses mobile is important cause every race has a siege vehicle that can destroy immobile useless defenses at long range.
Zerg: Guardian
Terran:Siege Tank
Protoss: Reaver