Why is my React input read-only with a warning?
Because you set value without an onChange handler. Either add onChange to make it controlled, or use defaultValue instead of value to make it uncontrolled. You cannot set value without handling changes.
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More FAQs in Common React Form Mistakes With Controlled and Uncontrolled Inputs
No. Use a single handler that updates state by field name, so one function handles the whole form. This is far less verbose than a separate handler for every field.
Because you forgot preventDefault on the form's onSubmit handler. Always call preventDefault and handle the submission in JavaScript to keep the single-page experience.
Not only on submit. Validate as the user types or on blur, so they get immediate feedback instead of errors only after submitting. This gives much better UX.
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