Want to be a pro ???? Dud you really need to get your basics
right.
Start with the terminals.
All commands (A-Z) for Kali Linux here:
a
apropos Search Help manual pages (man -k)
apt-get Search for and install software packages
(Debian/Ubuntu)
aptitude Search for and install software packages
(Debian/Ubuntu)
aspell Spell Checker
awk Find and Replace text, database sort/validate/index
b
basename Strip directory and suffix from filenames