Scott Wlaschin (the author of that site) does an amazing job of explaining functional programming concepts, and I highly recommend both his site and his book, "

Scott Wlaschin (the author of that site) does an amazing job of explaining functional programming concepts, and I highly recommend both his site and his book, "Domain Modeling Made Functional". But he does usually try to avoid words like "monad" and "functor", so you might not pick up fluency in the mathematically-inspired vocabulary from this particular resource.