Migration from Gatsby Cloud to Netlify - Certificate re-use?

Hi @Mayalab1,

You would only be able to use a custom certificate. At Netlify, we also use Let’s Encrypt, when you configure your domain to Netlify you’ll be assigned a Let’s Encrypt SSL certificate (unless you have a custom SSL certificate).

You can follow this Support Guide for configuring DNS:

Note, you’ll configure either Netlify DNS or External DNS (not both).