> If I don't remember the `df` command... what do I do apart from searching on the internet?
You can do that locally on the command line too!
You can do that locally on the command line too!
apropos apropos
apropos apropos apropos
More seriously: You can alias it to something you can remember, for example:
alias help=aproposThere are a small number of seed keywords which are ueeful to know. 'help' (shell), 'apropos', 'man' (online manual), 'info' (GNU documentation), and dwww (local documentation presented through a Web interface, available on Debian-based Linux, see https://ostechnix.com/dwww-view-complete-debian-documentatio...) are among them.
Knowledge requires a certain baseline.
If that's too much ... perhaps a GUI is in fact advisable.
disk space: nothing appropriate. catman -w
$ apropos "disk space"
df (1) - report file system disk space usage
$ man -k "disk space"
df (1) - report file system disk space usage
and
$ man -k "disk usage"
docker-system-df (1) - Show docker disk usage