The required field is not difficult to understand, but for some it is still a red rag. But anyways we have to insist on it. This happens not in order to bother people, but in order to assure the accuracy as many calculations are derived from the data.
Wrong and no information in required fields is therefore not acceptable and may lead to deletion.
Required fields are marked with a red asterisk *.
Even though other fields may not be mandatory, they are still important indicators.