Supercharge Scala Future | FP-Tower - Introduction

This video tutorial explores how functional programs can interact with the external world, such as databases and email systems. It is divided into three parts: building a command line tool, implementing an IO interface, and adding concurrency to IO implementations. The tutorial aims to teach testing with external dependencies, error handling, and retry mechanisms. It also covers creating a realistic flight aggregator and understanding the differences between future and IO.

What is the realistic problem mentioned that will be solved in Part 2?

What complexity is associated with the last section of the chapter?