How to use scripting in Shelly?

This is my first try understanding and working on some examples in Shelly scripting. I think I did quite a lot already showing what is possible, but there are a few other scenarios I wanted to do, but could not figure out how it can be done.

You find me examples here:
https://github.com/nygma2004/km/blob/main/shelly_script.md

Chapters:
0:00 Intro
1:53 Enabling scripting
3:16 Documentation
4:39 Simple blinking output
6:07 Asymmetric blinker
7:32 Handle button presses
10:55 Call script on another Shelly
12:56 Handle two Shellys at the same time
14:55 Calling public APIs
17:31 Final thoughts