If you don't have time to learn Vim (vi), nano remains your best option inside the terminal.
You can customize your version of nano by editing ~/.nanorc. Here is an example :
set tabsize 4
set tabstospaces
set autoindent
set trimblanks
set linenumbers
set constantshow
set keycolor cyan
set functioncolor cyan
set numbercolor yellow
set mouse
include "/opt/homebrew/share/nano/*.nanorc"If you're on MacOS, the default version of nano is quite old, you can use the latest version by running the following command :
brew install nano