I worked in the domain name industry for 4 years. Be careful which TLD you rent (you never buy it). If it’s free, it’s a bad deal, just don’t take it. If it’s a ccTLD (2 characters) not of your own country, don’t take it. Eligibility rules routinely change and you could get kicked out overnight. UK residents lost eligibility to .eu with Brexit for instance. Be careful with sexy ccTLDs such as .io or .so, they belong to small countries which sometimes don’t have a proper resilient infrastructure, and you expose yourself to more DNS issues. A lot of new gTLDs (ie. tlds other than .com, .net, .org and .info) suck ass and were created by speculators. Be very careful. I would only buy a gTLD managed by Google (.app, .dev), Donuts.inc, or Radix. Most of the other crap is not reliable enough to me.
If you can, just stick to .com, .net, or the ccTLD of your country.
If you can, just stick to .com, .net, or the ccTLD of your country.