ShellCheck is a static analysis tool for bash/sh scripts - try it on your scripts. The README also shows some examples of what (not) to do.

The link to your project gives me a 404 btw, is it a private repository?

https://courses.cs.washington.edu/courses/cse374/19sp/bash_style_guide.html

https://github.com/bahamas10/bash-style-guide

Choose whatever fits you

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

There is no single Bash standard to follow, only a few guidelines. One way you can check for some basic errors and formatting would be using an editor with support for Bash (in best case with a builtin LSP). At the end, you have to find your style and coding standards or adapt what others do if you want work with them or edit their files.

• Otherwise there is a well known tool for checking Bash files: https://www.shellcheck.net/ You can use it online and as a downloaded program on your local machine. After using shellcheck for a bit I got used to some of its conventions and recommendations, such as always wrapping variables like in ${variable} and some other things.
• Google has a coding style guide, but not everyone likes it: https://google.github.io/styleguide/shellguide.html
• Related is the Bash Reference Manual from GNU: https://www.gnu.org/software/bash/manual/bash.html Off course this is not a guide on how to style or program, but it helps in understanding how GNU does things.

BTW the mk-blog link is 404 for me.

https://github.com/bash-lsp/bash-language-server

• pretty much all editors support LSP these days

A yes, the fear of opensourcing.

Trust me, proprietary code is often total garbage because nobody looks at it.