To create an href WhatsApp link to a number, you can use the official WhatsApp URL scheme. The format for the link is https://wa.me/, where you replace with the phone number in international format, excluding spaces or symbols. For example, if the WhatsApp number is +1234567890, the link would look like this: Message on WhatsApp. This link allows users to open a chat directly with the specified WhatsApp number. Ensure that the phone number is active on WhatsApp and that users clicking the link have WhatsApp installed on their device for a seamless experience.