If you want to actually realize the amount of possible misunderstanding in the current conversation and of what shell scriting is, please do consider joning #bash at Libera IRC. Since there’s literally no understanding on what you mean still, sorry.

For a very simple example, there are literally no documentation regarding certain cases you’ll encounter in Bash’s built-ins even, unless you encounter it or learn from its source code. Not to mention shenanigans of shell use for inter-process communication (IPC), file-descriptors, and pipes.