Q: I want to learn music theory on my own as I don't have money for classes. What's a good starting point?
A: i think first try to get yourself a pianokeyboard you're comfortable with. that is pretty much your key to the world right there. then, here's what i think is a useful exercise you can do: imagine you live on a small island, with approx 20 other inhabitants. imagine, by default, you are responsible for all music on the island