Once I register a domain name, can I change it later?
Once you register a domain name, you own that domain for the length of time that you specified, although you can potentially sell it or to transfer ownership to someone else.
The good news, though, is that if you want to buy a new domain name and to use that one instead, that’s not a problem.
Finally, while it’s true that you can change your domain name, it’s best not to make a habit of it. After all, the more you use your domain name, the more powerful it becomes. Every time you change it, you lose a bit of the value that you’d worked hard to instill in the old domain name.