Okay, I already tried writing this once but my piece of garbage computer froze and when I restarted it everything was gone. Sigh.
Anyway, here are the basics (I trust you’ve got these down pat):
Scouting
Don’t be complacent
Don’t stack supplies
So yeah. I’m going to structure this in a map to map sort of fashion. Also, I only included advice on how to play vs Anders and vs Brute since they are the most used and most viable out of all the leaders in 1v1. However, you can apply them to other leaders and still be successful. I tried to be specific as possible, but understand that each situation is unique. These strategies are good, but they won’t guarantee victory; no strategy will do that. It’s how you play and the decisions you make while you play that determine the outcome of the game. Anyway… Here you go.
Barrens- (Vs Anders) This is a bad map for Brute as an Anders player can harass you with Hogs with little to no consequences because of the healing spire in the middle of the map. The normal build is temple 2nd (temple 3rd if you’re edgy and want to risk it) and a Factory 5th. Don’t bother with turrets as once again the Hogs can just get a heal. Once you have your first Wraith out, you can go get supplies and catch Hogs with your leader while the Wraith defends the base. Keep spamming Wraiths and get a Brute out to capture one of the reactor hooks. Once you’ve got tech 2, get Birthright on your leader. This protects your Wraiths from Gremlins (which are terribly easy for an Anders player to get on this map due to the reactors) and those pesky Spartans. Also, make sure your enemy doesn’t try to transition into air units. If they do, push on them. Transitioning leaves them vulnerable, and if they get up air you’ll be in a bad position. Notwithstanding that, do this strategy and you’ll be set up to win.
(Vs Brute) The best way of playing a Brute mirror on Barrens is to go temple 1st and mass Brutes. Never stop queuing them up. Scout the enemy and see if they’re Brute rushing. If they are, just stay at your base and get ready. They’ll be walking into Brute-central. If they aren’t, go ahead and hit them. They’ll probably start making Brutes to defend their base, so get Inheritance and stun them whenever you can. If they push you off, get Citadel and start double pumping Banshees. If they don’t push you off… Well then you won 
Blood Gulch- (Vs Anders) The standard build on this map is to go temple 2nd and get your leader to the supply hook ASAP. Queue up a Brute to take the hook. As a side tip for taking hooks as the Brute, move your leader in first to vortex the sniper then run him away while putting your Brute squad in the hook. The rebels will target the Brute and you can bring your leader back in to finish them. Scouting is vital on this map as some Anders players like to go Hogs and some like to go full on infantry in order to get map control faster. If they’re building Hogs, get a turret up before 2:30 (which is usually when the Hogs come it to harass you.) After you capture the hook, get Citadel. If the enemy has Hogs, go for a Hall and Factory and produce Jackals and Wraiths. If they have Hogs, it’s also smart to take both reactors by splitting up your Jackals in order to keep the enemy from getting Gauss Hogs. If they’re going full on infantry, double pump Jackals and prioritize the supply hooks over the reactors since upgraded Marines aren’t as dangerous as Hogs. And remember to always watch out for when the enemy tries to be sneaky and transition to air.
(Vs Brute) Go temple first and scout the enemy while getting control of your supply hook. If they’re Brute rushing, make sure to produce your own Brutes and get Inheritance if necessary. Keep your Chopper at the enemy teleporter and ram any Brutes that come out. If they build a Hall on their Keep, they’re most likely performing a delayed rush and mixing Brutes with Jackals. This is typically more dangerous than just a standard Brute rush as it can catch you off guard. The only good way to counter it is to do it yourself. Build a hall on your Keep and produce Jackals and Brutes. If that is the way the game goes, a base race ensues and whoever destroys the enemy base first wins. However, if it’s just a standard Brute rush (which is probably will be), just transition into a double Summit after you push the Brutes off and pump out Banshees. The enemy most likely won’t be able to counter it fast enough due to them spending too much on the early game.
Blood River- (Vs Anders) Go temple 2nd and get to your supply hook ASAP while queuing up a Brute vortex destroys the sentinels very quickly, but try to avoid using it as it will drain your eco. After you’ve captured the hook, build a Hall 5th and get the Jackals pumping. It’s also important to upgrade your leader’s vortex as UNSC love to spam flamethrowers on this map. However, some people build Hogs as well and if that is the case (scout as always) then get up a turret before 2:30. If no Hogs are being produced (you can tell if a Hog is queued up if the lights on the UNSC base are flashing) don’t bother with a turret. If the enemy tries to take your hook, station Jackals in the sniper towers and vortex the flamethrowers. You should be able to hold them off even if they’re double pumping. If they go for their reactor hook, ambush them while they’re engaging the sentinels there. Then you can hijack the reactor and get beam rifle. With that, you can then take their reactor and get map control. Between all that, make sure to get Citadel and get up another Hall (if they’re going full infantry) or a Factory (if they’re going Hogs). Most likely once the enemy loses map control, they’ll try to transition into tanks. Just sit back and pump Hunters. However, remember not to assume anything. Make sure to scout.
(Vs Brute) Go temple 1st and take your supply hook ASAP. Don’t stop producing Brutes and go for a Hall 5th. Once again, upgrade your vortex. If they don’t push on your hook, push on theirs. Target the Jackals in the towers and get into them while vortexing enemy Jackals to try and get an advantage. Also, station your Chopper on the enemy teleporter to ram reinforcements. If they push you off, you’ve lost the game since they can then push on your hook and you have nothing to defend it. If they get both supply hooks, they can just out produce you to death. However, if you manage to take their hook, you win. It’s quite simple.
