A neat thing is that a lot of command line programs use readline. So learning and configuring it will also be useful in for example the Python REPL and calc.

Here are some neat configuration options you can put in ~/.inputrc

set completion-ignore-case on
set show-all-if-ambiguous on
set completion-prefix-display-length 9
set blink-matching-paren on
set mark-symlinked-directories on

And if you are a sensible person who is used to vim

set editing-mode vi
set show-mode-in-prompt on