#1
Advice for beginning JASS AI scripters
Aside from using a JASS syntax checker and the JASS manual, here are the most important things what I've learned in a gist:1. Use only native functions (marked native in common.j and common.ai). Blizzard-made non-native functions usually mess things up more than they help.
2. Check out what doesn't function in AI scripts: http://www.hut.fi/~tgustafs/wc3_donotworkinai.html
People are welcome to add more from their experience.