Async-await and Task don't need to be so scary and mysterious! In this session you will learn what is asynchronous, multithreading and parallel programming and how it can help you to improve performance of your code, when used correctly, using newest best practices. It's easy to misuse those concepts without proper knowledge, and hurt performance. This talk focuses on .NET Core / .NET but most of the content applies to .NET Framework, too. All of it (and more) is covered in my book "Asynchroniczność i wielowątkowość w C#".