Well, you're going to get conflicting stories, because everybody has his own idea. Best thing to do is use the Advanced Search function located at the top of the page, use keyword 'Pruning' and from the dropdown box select Titles only (or something like that). That will give you a list of discussions with Pruning in the title. Go through them and learn what people think, and hopefully you'll see a few examples. A few very general rules are make your cut just above the node, and do not prune once flowering has started. There are a couple Stickies in the Advanced Marijuana Cultivation forum that address forms of pruning and training.