Here’s a little guide to get a dev environment going on a Chromebook. I wanted to get Chrome OS Flex installed on a very old Macbook Air (2013) so I first installed Chrome Recovery Utility as a Chrome extension from the Chrome Web Store on the stock MacOS install. I launched it and ran through the steps to create bootable media (make sure to choose Chrome OS Flex for device/model)
Rebooted the MacBook Air, holding Option to force to bootloader, and then fired it up. Was quick and painless.
To get Visual Studio Code going on your Chromebook, follow this guide:
https://code.visualstudio.com/blogs/2020/12/03/chromebook-get-started
This should get Linux installed into a container on your Chromebook and then Visual Studio via a debian package (available via a Linux Apps folder under Apps)
Then get GitHub Desktop
Download the appropriate .deb file, find in Downloads and double-click to install. Find in Linux Apps and launch!
It’s extremely impressive how the Chrome OS team seamlessly integrated a Linux terminal and the ability to run UI apps via their app tray turning a Chromebook from a simple browsing device to a full-fledged development environment!