FP is going to feel like programming 101 at first before you get over that initial hump. That's the way it went for me at least. The trick is seeing it through

FP is going to feel like programming 101 at first before you get over that initial hump. That's the way it went for me at least. The trick is seeing it through and making it past that first frustration phase. Once it clicks, it will change the way you think about programming. I'd say pick up the defacto book in one of the langs you listed and get started! I went with Elixir, and I'm hooked. Dave Thomas' Programming Elixir is an excellent place to begin.