[viraptor]

ls /usr/bin

Choose a random entry you don't recognise and open the man page for it. There's not that many on most systems - I mean, there's likely a couple hundred or more, but some are convenience symlinks and many you'll already know.

For things you may not have by default, there's a few "awesome" lists available, like https://github.com/agarrharr/awesome-cli-apps

[avgcorrection]

Hmm, tried that but that directory seems to contain ~3000 files on my old Ubuntu.

[myself248]

1621 on Pop, which is still about 15x more than I can reasonably remember. Hence the whole problem, it's not digestable unless you make digesting it your whole hobby. Ah well. Thanks for confirming, I guess.