To install zinit, see https://github.com/zdharma/zinit/blob/master/README.md
Then, append this to the end of .zshrc.
#
# self upgrade zinit with the following command
# `zinit self-update`
#
# Update snippets - zinit update {URL}.
# Can also use `zinit update --all` to update all snippets (and plugins).
#
#
# Load personal settings
#
zinit light eho/zinit-config
Auto completion must be initialized before the Zinit's installer chunk. Place the following just BEFORE the Zinit's installer chunk that was auto added in .zshrc.
#
# Enable auto completion
#
autoload -U compinit
compinit