how install in LINUX?

$ git clone https://github.com/wsl-iq/install-scrcpy.git
$ cd install-scrcpy
$ chmod +x *
$ sudo bash install-scrcpy

How it works?

$ python3 scrcpy.py

what's he doing (python3 scrcpy.py)?

This gives you the choice between connecting to your Android phone
via the USB charging cable or via your Android phone's IP address,
as it saves you time and ease.