My experience goes back about 45 years.
I learned from family in the early days, mostly single shot .22's and 12 ga. shotguns.
When I bought my own firearms, they were .22 revolvers and .22 lever action rifles. When I moved up to centerfire, it was first single action revolvers, then 9mm pistols. It was voracious reading of gun rags that got me to buy the first autoloader.
Then my source of info came from buying and selling at gun shows, making some really good buys, and some really dumb buys.
Then I joined some online boards, late in the game, just late last year.
But overall, I have learned the most by doing; buying, selling, trading, reading, shooting. The difference now is that I am coming closer to knowing how to balance the information sources.
Gun rags (which I never buy anymore) are a source for who makes what, and what is coming out, etc. I review them periodically at the book store.
I used to go to about a dozen gun shows a year, but I have cut back because they are smaller, plus I have added internet buys to the mix.
You notice that I did not mention gun stores as a source of info. I have bought several guns from one particular store with good prices, who has an honest owner, but I have never gone there to get information.
Believe it or not I have gotten good info from chain store employees. Why? Because they are low wage guys who work there because they like guns and don't work on commission. I have been on both sides of the counter at chain stores (worked at Dick's about 8 years ago) and learned a lot from other employees.
The most reliable and comprehensive source now for me is a combination of internet forums and personal experience with hardware in hand. poppy