3: A look at the macro of the different races
Now, I'm no expert on the macro of different races, but I do understand the basic concepts. We'll break it down by race and explain how this effects late game play 3.1 Zerg
Zerg is the most different from the other two races. Whereas Protoss and Terran macro revolves around taking more bases and building more production structures to build more units, Zerg macro revolves around taking more bases to build units, as the hatcheries are their production centers. One base with a queen can spawn 7 larva every minute or so. I don't know the exact timings on that. These larva are used for both workers and combat units. The term "Droning" refers to the Zerg using all larva to make drones, as there is no pressure to build combat units. So, if you get this trend, Zerg players can make 7 units at once on one base, 14 on two bases, and 21 on 3 bases, and the number goes up and up. This allows them to rebuild armies very quickly late game and overrun opponents, hence the name "The Swarm."
I heard it put best this way one time: "In a match, the goal of Zerg is to keep expanding. The goal of their opponent is to stop them." If you can limit the number of bases a Zerg can get, you can out macro him, both in income and production. He gets on 4 bases...good luck. You can destroy his entire army and it'll be back up by the time you get to his base. You have to limit the amount of units he can produce. 3.2 Protoss
Protoss Macro is much similar to Terran, in the fact that they also have to expand and build more structures to help manage that income. The difference is chrono-boost and warp gates. With Chrono boost, they can saturate expansions quicker, which is why we have mules to help keep up, until saturation. Then you can use the energy for scans. Chrono-boost can also be used on buildings, allowing quicker research, unit production, and decreased cool-down time.
Warp gates also allow them to warp in gateway units anywhere there is a pylon, allowing for instant reinforcement of every unit except those built from a robo bay or stargate. This is why they will throw down a proxy pylon nearby your base when they push. They can warp in reinforcements across the map quicker than you can rebuild, especially with chrono-boosting.
With Protoss, like Terran, you want to limit the number of expansions they have. This can make some of their buildings worthless, because they won't have the income to build out of them. Once they get 8+ gates, they can reinforce so quickly that you will have a hard time breaking them. This is where your own high level of production structures can come in handy. Have a steady stream of reinforcements rolling in every 30-60 seconds.
I know this is an insane wall of text, but its my hope that this helps out whoever reads it. If this post helps one person take their game to the next level, then it'll be worth the time spent working on it.
If you have questions or something isn't clear, or just want help with your macro game, I'll try to check back here and answer questions. Due to people messaging me in game, I'd like to add, I don't mind that, but I do play and watch a lot of replays, so if I'm set to busy, or don't answer you right away, I will when I get done with whatever it is I'm doing, or if I have time.
Also, a player made a post with Macro tips in this thread that is pretty good as well. Check it out.
Caustic - http://us.battle.net/sc2/en/forum/topic/375107712
Also, I'd like to thank Clan RH for helping me learn and grow as a player, and for giving me the idea to write this post. Check us out at:
Keep gaming, and learning.
To break it down into simple steps:
Always build SCV's, until the late-mid game when you have a fully saturated 3'rd expo
Always know where your next expansion is going to be
Build enough production structures
Try to never be supply blocked
Take a 3'rd expo before your main runs out
Upgrade your units
Late game build more production structures
Have a plan you stick through the whole game, unless changing that plan becomes necessary, such as early pressure or air rushes.
If you want to know how to do that, read the big post where it relates to what you want to know.