Keep the form minimal
For a first business inquiry, customers should not need a password, OTP or account creation. Full name, business name, phone, email, service interest and requirement message are usually enough.
Validate server-side when connected
Client-side checks improve user experience, but real validation must happen on the server or lead API when a backend is connected.
Protect against abuse
Rate limiting, spam protection, input sanitization, secure headers and careful logging reduce risk without making the form painful for real customers.