Here's what I found through 1 day and 2 nights of woodcutting: You don't get a log for every one you break. I take it the chance of not getting one decreases as you gain levels. Every some percent of woodcutting experience you get, it displays your percentage until you gain a level on your screen. I think that is really neat. You gain experience from cutting down placed logs as well as naturally spawned logs. You gain experience from breaking logs even if you're not holding an axe. Breaking leaves doesn't seem to do anything. NB: I only worked on spruce but I'm assuming it's the same for all kinds of log.