What is validating form data and explain the issue with the asset function

What is validating form data and explain the issue with the asset function (Chapter 2)?
Give the syntax for:                                                (a) inserting a record in a table                                (b) updating a record in a table (Chapter 5).Explain the use of hidden form inputs (Chapter 10 What information is stored on the user’s machine using cookies and how they are set (Chapter 12)?

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