When you plant gets to it's 5th node and begins growth of the 6th, then snip off the top so that you begin growing 2 tops. That will also stimulate lateral growth and side branching, then when your 2 new tops begin to grow up, then you can begin training them in opposite directions. You can top side shoots if you want too. The sky is the limit really. It's all about time utilization for me. I don't wanna fuck around in veg forever. I want a harvest. I don't aim for yield anymore cuz you can even give weed away anymore here in Canada the markets are so saturated, so i just do whatever. If i get a pound of smoke in a 4x4 i'm satisfied. Could i do better, yes. Could i do WAY better, yes, but why? Who cares. By the time my next crop comes down i won't be even close to getting through the first pound. I have so much weed i dunno wtf to do with it all haha.