Starcraft

First off, do the obvious thing. Make SCVs. Start mining. When your 8th SCV is being built, make a supply depot. Keep the SCV that made a supply depot next to where the depot is. Keep making depots when necessary. Also make a comsat station to find your enemies early. Make about 5-7 SCVs then start making a barrack or two and an engineering bay while more SCVs are being built. After your barrack is completed, start mining gas. Make some bunkers around your choke point(s) and start filling them with rines. Make an academy and make some bats and some medics to cover your bunkers. Remember to upgrade stim packs and +50 Medic Energy and DEFINITELY upgrade your units. Remember to keep making SCVs while doing this. While upgrading, make some more rines and stim all of them. Also, make factories and machine shops. Make tanks and goliaths and upgrade Siege Mode. While doing this, make turrets in the spots you feel are most important (around barracks, CCs, factories, and most importantly, your choke point).

I'm sure that by this point, if you're not playing against many other people, the person (or people) that you're fight will have attacked by now (especially if they're zerg). Just make sure you have plenty of medics to cover your bats and some SCVs to cover your bunkers when you're being attacked. Have your tanks siege at the choke point and around your SCVs. If there are any open resource areas, send some SCVs there and make a CC. put your goliaths and most importantly, your tanks. Mostly surround your CC with goliaths and put the tanks at the choke point. At your main base continue making tanks goliaths, and rines (rines are oppional). Next, make armories (I'd say at least 2 to upgrade faster) and Starports. Upgrade your ground armor and ground attack first. Make science facilities for your BCs (if you like using ghosts early, make a science facility with a covert ops during the time your making tanks and use them for your defence).

Don't bother making wraiths. They're useless. Instead focus on upgrading your BCs BEFORE a lot of them are made. Send some to your main choke point (if you have more than one) and send the others to your major areas to help the turrets. Now you should make some ghosts. Make more CCs (mostly at your extra bases) and make nuke. silos. Remember to make some turrets and good units to protect your extra bases. They are very important when versing 1-3 people in an 8 person map. They too, will have extra bases. Obviously, make nukes. Check your enemies with your comsat to see what they have been doing. Finally, the fun part. Send 2 or 3 ghosts to the main base and if possible, hit their supply building (depots, pylons, and overlords). If not possible, kill their major units and try to get to their unit- making buildings (starports, spires, robotic facility). Remember to build the nuke RIGHT after it is launched.

Be sure to make a lot of BCs and then send them to the extra bases. Also, make sure you have fully upgraded your units. Keep nuking major areas if possible, and then send your BCs in to the main bases once they are done with the extra bases. If your opponent has an ally, make sure to keep sending more units into the enemy bases to make sure you don't get finished off quickly. While attacking the enemy, make some stronger units but keep them at your base. This is useful for 2 reasons. 1. if the enemy starts attacking you, your base will have some defence and 2. if you the enemy's ally send a hoard of units to where you're attacking, you may get finished off so have units back at your base would decrease retaliation time. When one of your opponents is eliminated, send your units back to your bases. Do the same thing to the other enemy. If you're only versing one person, then you probably have won.

P.S. this may not always work (especially against pros) and I use this strategy only at Fastest maps, so I suggest you only use them there also.