and I would add some more reasons how VPN can be used - check this article http://myvpnservice.com/blog/7-reasons-to-use-vpn/

one more way to force quit right from the tool bar is using a free app Memory Cleaner, which provides the options to quit and force quit any app. Here is more about it - https://nektony.com/blog/how-to-force-quit-on-mac

I think the easiest way to hide and unhide files is to use Funter - https://nektony.com/products/funter/ . It’s a free app, why do people not use it?

If you have troubles with Terminal, I’d recommend to use a free app Funter, that allows to hide and unhide hidden files in one click -https://nektony.com/products/funter/

It is also possible to view running processes and force quit apps via Terminal. Find here which commands to use for that - https://nektony.com/blog/task-manager-mac