There are books out there, a few are mentioned here and here. I’ve tended to the more disorganized approach of reading explanations of particular circuits and googling particular topics until it starts coming together (and a lot hasn’t, yet). As for simulation tools there are lots of them, the one I’ve been using is circuitlab.com. It’s of limited usefulness if you don’t pay for “pro” access or whatever they call it, which as I recall is about $24 a year. Which I pay because I find it worth that.
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