Brew is a packet manager. It does the same thing as
apt does.
Do you have linux or mac ?
Apt is used on linux (apt install "whatever") and brew mostly on mac (brew install "whatever")
"sudo" is just a linux way to say "run as administrator" and it will ask for the password for your root account (master account when you installed linux)
Mac is what i have. More like saying $sudo apt install "whatever" on linux and homebrew/bin/brew install "whatever" since i was denied access to sudo. This made me install brew manually