Parent categories: Software principles.
What should we do of computer errors?
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Computers fail. All the time. Websites stop working, compiler errors, system error messages, websites fail to do what you expect.
Let's talk of error messages
No child categories.
method Errors have resumable error codes
I was told how to get the Nth product on Stackoverflow, he also told me how to get the product number from a product! Which you must understand how useful that is. Error messages can be completely retried and resumed with this information. I only need to log or print out a special error code and the user can retry from where they left off!