This is a good tutorial on mc (midnight commander) — a file manager that runs in the terminal.
There’s also a cheatsheet here:
I also found a few skins and changed mine by adding an alias like this:
alias mc='mc --skin=gotar'
There are various other themes available online if you search around (like Dracula).
This command will print some documentation about colors:
$ mc --help-color
There are more tips here: