Some other commands you might like:

Ctrl+c

Ctrl+z

Bg

Jobs

Ctrl+u

Ctrl+w

Ctrl+l

Thunderbird, and probably betterbird, is too bloated for my taste.

Lubuntu

My first foray into unix-likes was oprnbsd with fluxbox. I eventually moved to openbox. Lubuntu with lxqt gives a nice simple openbox experience with a menu and stuff. I customize it to have openbox present the mouse menu instead of the whole pcmanfm desktop thing.

I’ve been using Linux for a couple decades now – I use Windows at work and came to like bing desktop; it’s unexpectedly nice.

There’s always Ctrl+R

It could be a music server with mpd – then you could configure it to stream over http to other devices. Or you could configure it as a client for a music server you keep somewhere else.

Just ext4 on my Linux things; I got scared away from btrfs because of some file loss horror stories