I read whatever interests me until it doesn't interest me any more, and I quit reading things that don't interest me. I don't say that to be flip—it's actually

I read whatever interests me until it doesn't interest me any more, and I quit reading things that don't interest me. I don't say that to be flip—it's actually what I do, and it has allowed me to consume an enormous amount of material over the years. The only trick to this method is not to confuse difficulty with boredom. There are times when I learn to code, for example, or when I read about obscure financial wizardry or mathematics, where my mind drifts and it feels like boredom. But the reality is just that it's hard. Sometimes when things are hard you do have to change your track until you've developed prerequisite knowledge to come back to it. Just make sure in those instances not to decide the thing was boring because you couldn't handle it on the first go.