What's a good resource to learn how to use cameras correctly?
And the internet. Just search for whatever questions you have and you’ll get tons of results. Now that it’s all digital, you can try a bit of everything and see what you like (and ignore what you don’t).
But I learned a lot more by joining a local photography meetup. They would hire models to practice portrait shoots with and the main people were very helpful. They charged $50-$60 per shoot though.
Fair warning, back then I ran into a lot of photographers who did photography for living and were pretty grumpy about dwindling incomes. Don't let their snarky comments discourage you from going to meetups.