What does it mean and how can I fix it?
zsh compinit: insecure directories, run compaudit for list. Ignore insecure directories and continue [y] or abort compini
None of the solutions listed worked for me. Instead, I ended up uninstalling and reinstalling Homebrew, which did the trick. Uninstall instructions may be found here: http://osxdaily.com/2018/08/12/how-uninstall-homebrew-mac/