Thread Pool Courses

Android Threads: Getting Started
Pluralsight

Threading in C#
LinkedIn Learning

Modern C++ Concurrency in Depth ( C++17/20)
Udemy

Java EE: Concurrency and Multithreading
LinkedIn Learning

Parallel and Concurrent Programming with C++ Part 2
LinkedIn Learning

Python Network Programmability: Scaling Scripts
LinkedIn Learning

Java Multithreading
YouTube