How to use WhatsApp using a landline number without revealing your mobile number

WhatsApp needs a contact number to sign you in. Now, the good part is this contact number could be of a mobile or landline. You can register a landline number to use WhatsApp but not the regular WhatsApp app. This is exactly how WhatsApp business accounts operate. You use your landline number to send WhatsApp texts, you will need to download the WhatsApp business app.
If you wish to hide your mobile number and use WhatsApp from any landline number here is how you can do it.
-You would need a working landline number.
-Download the WhatsApp Business app (WA Business).
-After WhatsApp is installed, the app will ask for a phone number for OTP-based registration.