vercel.com > Setting > Domains > click "Add" button
https://vercel.com/guides/how-can-i-debug-a-dns-record
How to Troubleshoot Common Issues with DNS Records
Learn how to troubleshoot and debug common issues with DNS records such as having multiple A records, an incorrectly configured CNAME record, and more.
vercel.com
An apex domain is your root domain without any subdomains, like vercel.com. Notice that there is no www prefix. If you'd like to have your apex domain hosted on Vercel, make sure that you have a single A Record with the value of 76.76.21.21 (Vercel's Anycast IP Address).
