I have installed Armbian_22.02.1_Orangepizero_bullseye_current_5.15.25.img.xz. I started my OrangePi 0. I chose ZSH (not BASH) I did Update and Upgrade. When trying to execute the command (as a normal user) build-essential I get:

orangepizero:~:% build-essential
zsh: command not found: build-essential
orangepizero:~:% sudo apt-get install build-essential
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
build-essential is already the newest version (12.9).
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
orangepizero:~:% build-essential
zsh: command not found: build-essential

How can I successfully run build-essential?

build-essential isn't a command. It is the name of a meta package that contains various tools to actually build stuff from source code.

Moved to P2P help.