I've watched more games than I can count. I have read the rules. I have even played more than a couple games (granted, more than 15 years ago). I STILL do not understand deployment.
It seems pretty important- Sandwyrm over at theBack40K says his single biggest piece of advice is to practice. I've read countless battle reports where deployment appeared to have a hand in the win/loss outcome. I understand that it's got a crucial part to your strategy and approach to the game.
I just simply don't understand it. For all proactical purposes the whole "get your guys on the board" section of the game might as well be written in Sanskrit by Einstein. Deployment is akin to anything with an "8" in it for me.
I'm sure that explaining it in comments is likely "unpossible"; so if you could send me to 40K for idiot's school, or point me in the direction of a good website with clear and easy to understand descriptions of what to do when and WHY; maybe I'll learn something. [Maybe.]