Couldn't help but reply to this one...great question!
A few ways that I have learned over the years:
One thing that is very helpful for me was hooking up with other people who had been doing video production longer than me. Somewhat like a mentor, but just going with them when they needed an extra hand on a shoot, or asking them questions via email. I found mine in school and at local TV Stations. But also some companies/organizations have media producers who are a good source for this as well. That has been the best and quickest way for growth for me.
For particular video software, I use
Learning @ Your Own PaceŽ - lynda.com. Its like 25 bucks to access all their tutorials for a month. This has been the most helpful for learning anything i didn't know in terms of software. A mentor showed me this site as well.
Also, take a college class if you can. If there are not cinematography classes (like in my old city) take a photography class. I did and found it very helpful for stuff like aperature and shutter speeds.
Finally, I'd recommend just getting out there and shooting and using your camera. If you get stuck, read the manual. But try to connect the manual with actually touching the camera. You be as good as you know your camera
Hope that helps.
Austin
MakingBetterVideos.com