[indymike]

Since "terminal" often really means the shell that runs in the terminal, try searching for tutorials on bash or zsh.

"bash tutorial" "bash basics" for most unix-ish operating systems

for recent macs, "zsh tutorial" or "macos zsh tutorial" or "macos zsh basics"

bash is the usual shell, zsh is now the default on MacOS. zsh fixes some rough edges in bash.