There's more detail to be found in the Reddit thread linked to in TFA.

Here's an example link from that post with a few more details on the setup and process: https://cosmicbackground.io/blogs/learn-about-how-these-are-...

Here's a guide for astrophotography beginners: https://www.reddit.com/r/AskAstrophotography/comments/e609qd...

This article compiles a list of some popular software used for astrophotography: https://www.highpointscientific.com/astronomy-hub/post/astro...