Namecheap

A good domain name registrar.

A domain name registrar should do the following things:

• have good registration/renewal fees

• support many TLDs including those you plan to use

• provide Whois Privacy (for free or at nominal cost)

• have a quick and logical administration interface

• allow using third-party name servers

Namecheap checks all those boxes for me, so I've been using them for a long time now.

Buy a domain name - Register cheap domain names from $0.99 - Namecheap

Cloudflare has also entered the domain registrar business and I've experimented with using them too. Currently not enough supported TLDs (specifically country codes) to use it exclusively.