Where you can read about error codes which need to send to the client in different cases?

What is the code to send if the user is not found in the database, the username or password is invalid. Is there a similar reference or just experience ?
April 3rd 20 at 18:49
3 answers
April 3rd 20 at 18:51
Solution
April 3rd 20 at 18:53
Solution
April 3rd 20 at 18:55

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