If you’re interested in writing safe shell scripts then check out shellcheck:

https://github.com/koalaman/shellcheck

If you’re interested I’ve written a git hook for it that runs a check when you git commit:

https://github.com/alblue/scripts/blob/main/shellcheck-pre-c...

You should also check out her Google shell script style guide:

https://google.github.io/styleguide/shellguide.html