Zsh

ZSH is a shell, it is almost entirely backwards compatible with bash with several additional options.

Documentation

official docs	http://zsh.sourceforge.net/Doc/Release/index-frame.html
zsh manpages	https://manpages.debian.org/buster/zsh-common/index.html

Turorials

completion overview

https://thevaluable.dev/zsh-completion-guide-examples/

Locations

~/.zshrc	rcfile
/usr/share/zsh/functions/Completion/*/*	builtin completions (see $fpath)
/usr/share/zsh/site-functions	third party zsh completions

Components

ZLE	man zshzle	zsh's line editor
compctl	man zshcompctl	old completion system
compsys	man zshcompsys	new completion system
compwid	man zshcompwid

See man zsh and man zshroadmap for overviews.

Notes

zsh autocompletion

zsh widgets

zsh keybindings

zsh history

Extensions

zsh antigen

zsh plugins