Honesty this whole site is a gold mine. Even if you are not interested in using a functional language, if gives you a different perspective which was very helpful for me. I would recommend other posts as well.
The series on building a parser combinator from scratch has been one of the most valuable things I've read and worked through. A lot of concepts and mechanisms from that have been just incredibly useful working with typed languages in a functional style. I still will never know what a monad is tho.
