I've just gone through this process over the last couple of years. To be honest, the most effective learning tool for me was dedicating my free time for a little while to learning Haskell. It's a higher upfront cost but a huge pay-off, not just in terms of understanding fp-ts but more broadly in how you'll be able to view programming through a new lens.

That said, I wrote this[1] a year and a half ago for some colleagues just as I was getting into it myself. I hope it helps, and if not let me know if there's anything more specific I could help with.

[1] https://samhh.com/blog/js-fp-jargon