For showing hidden files and file extensions, there's a Terminal command you can run to permanently set it for every file. Of course, since it's only exposed through some command line utility, I forgot what it was and would have to search again.
The example given isn’t really something most users need. Even when I did need to do that the answer was discovered and executed within 20 seconds of googling. This is the same for other things most people don’t need across all the prevalent OSes
As for the monitor, just install Monitor Control: https://github.com/MonitorControl/MonitorControl
After using a Macbook for work for 4 years, I still have no intuitive idea which modifier keys should be used when, it seems to be random.