Earlier quoted context omitted.
I just type "help" into anything that looks like a prompt. From there things are usually discoverable enough, and if not, now I have strings, that I can C/P straight into a search engine. ;)
zsh: command not found: help
GNU bash, version 5.0.17(1)-release (x86_64-pc-linux-gnu)
These shell commands are defined internally. Type `help' to see this list.
Type `help name' to find out more about the function `name'.
Use `info bash' to find out more about the shell in general.
Use `man -k' or `info' to find out more about commands not in this list.
¹https://man.openbsd.org/help