Could be this: https://github.com/ValveSoftware/steam-for-linux/issues/11446

Red Hat 7

What games will not be possible to use on Linux?

Most online games that have anticheat. (yes some work but most don’t even if the anticheat could support linux.)

For example, will something like Escape from Tarkov work?

No

And is comparability with older games better or worse than W11?

YMMW. but often linux plays older windows games better than windows.

In mouse settings there should be option “Press middle button and move mouse to scroll”

In the first one the tutorial expects you to just leave the function in circles.py, after you have create the separate unit test file.

On the second one, You are probably trying to run the tests while inside the “test” folder. You need to be in the project folder when running the python -m unittest discover -v