I’m reposting this as I think a lot of players here still need it.
Basic Info:
http://www.halowars.com/forums/thread/530155.aspx
If you’re really bad, an old, basic general guide. It’s pretty dense in helpful information for newbs, but there’s a lot of generalizing and flat out incorrect things, so read with a grain of salt.
http://www.halowars.com/assets/units/HaloWarsUnits.xls
Raw data about the units. Some things may not be up to date, so you should also know about the few Title Updates (TU1-4) that balanced the game some. TU4 info is at the top of: Halo - Official Site (en)
For teams:
http://lazyfrog.us/forums/showthread.php/418-Basic-2v2-Cutter-Guide
2v2 Cutter Guide --April '12. Kihz goes map by map on the common cutter builds, and gives general insight to 2v2 if you’re clueless.
http://www.halowars.com/forums/thread/929845.aspx
A decent, short 3v3 guide. It’s simple, but covers most of the important things to not be sh*t.
http://www.halowars.com/forums/thread/881079.aspx
A longer guide. There’s sure to be redundancy, but you should probably re-read some of the things anyways, because they really are important. Its a little old, has some inaccuracies.
1v1 Guides. These cover higher level strats; if you don’t have good fundamentals, these will only help so much.
http://www.halowars.com/forums/thread/931231.aspx
Thorough Anders 1v1 Guide
http://www.halowars.com/forums/thread/931481.aspx
Decent Brute 1v1 Guide
Those are the two best leaders in 1v1.
http://www.halowars.com/forums/thread/837966.aspx
General UNSC 1v1 Guide. Written by a great player, but only goes over some basic builds for most matchups involving unsc. Stud’s goes over anders better, but the forge and cutter strats in the orginial post plus Soupy’s cutter build on Tundra are helpful.
If you want to get good, it would also help a lot to watch videos from this thread:
http://lazyfrog.us/forums/showthread.php/139-High-Level-Halo-Wars-Vids