Though this process will be streamlined in the future, installing the Windows Subsystem for Linux (WSL) 2 today requires multiple steps. Here are the steps I’ve used, multiple times, to make sure this goes as efficiently as possible.
Note: These instructions are an excerpt from the Windows 10 Field Guide, which is now being updated for Windows 10 version 2004/20H2. They will be included in a coming update to the book.