Pruning (outdoor)

I was just wondering if i could get a few different opinions on the best way to prune and top a plant that is growing outdoors. and how do u know when it is time to top and where and how many times. that kinda stuff.

GrowFAQ has an entire section on pruning. Articles with pics check it out.

im quite aware of that. in fact, ive read it. i did not see anything relating to outdoor pruning specifically. Do i need to prune as much off the bottom to increase air flow even if it is in a field? i'd just like some advice from someone with allot of personal experience