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As Fae mentioned you need to register a domain. I used to use crazy domains but moved away from them.
Google used to sell domain but sold that off to square space
domains.squarespace.com
Namecheap is a decent choice too
www.namecheap.com/domains/
and I use Cloudflare but that's because I use their other services
domains.cloudflare.com
Just look up the domain you want on all 3 and choose whatever one has a better price for you