pfps-shopping-cart VS trading

Gabriel Volpe has a book that goes over just that using the typelevel stack. I highly recommend it: https://leanpub.com/pfp-scala

if you don't want to read a book and just want the code it is on github here: https://github.com/gvolpe/pfps-shopping-cart/tree/second-edition

The only issue I had was how to put all this knowledge together. For that I bought Practical FP in scala by Gabriel Vlope, it's not for beginners, tho but takes you through a project with the latest typelevel stack. Here's the link. https://leanpub.com/pfp-scala.

If you want a solid understanding of FP and not just FP in Scala, I highly recommend installing GHCup and working through Haskell Programming From First Principles. Then I would work through Scala With Cats, Essential Effects, and Practical FP in Scala for how all of that maps onto Scala.

BTW for learning good application structure with Tagless Final I really recommend the book Practical FP in Scala and its work-along example application. That's where I stole the pattern above from.

Practical FP in Scala

Functional Event-Driven Architecture

Functional Event-Driven Architecture for the ZIO ecosystem. I hear Zionomicon is evolving again, and that's good news. But there's literally years of more work to do.

https://leanpub.com/feda, This book also by Gabriel vlope is another good one. I bought them together on offer in december. Functional event driven architecture. It done in scala 3

Functional Event-Driven Architecture

Personally, I would go for https://github.com/gvolpe/trading

Practical FP in Scala: A hands-on approach will definitely help you to feel how FP Scala applications are built in the real world. After that Functional event-driven architecture: Powered by Scala 3 can be your next read. Regarding free video materials, I could recommend Jakub Kozłowski and DevInsideYou. Also, there are two great courses from RTJVM: Cats, and Cats Effect.