I want to learn more about guns, where can I start besides Wikipedia?

For a long time I used to be passively against gun ownership, but talking with people who are in favor of it made me realize I don't really know much at all and was mainly afraid because I didn't know how to use a gun safely. I want to change my perspective and maybe feel less fear about it.

I have a few questions but I don't want to act like a faggot by asking too much at once. Any beginner materials are appreciated.