The best domain name to buy is one that is short, memorable, and easy to pronounce. It should also be relevant to your website or business and not be easily confused with other domain names.
When choosing a domain name, it's important to avoid using hyphens, numbers, or special characters, as these can make it harder for people to remember and type your domain name correctly. It's also a good idea to avoid using domain names that are too long, as these can be difficult to remember and can be easily truncated or shortened in a way that changes their meaning.
In general, the best domain name is one that is simple, easy to remember, and reflects your website or business. You can use tools such as a domain name generator to help you come up with ideas and find available domain names. You can also check if the domain name you want is available by doing a search on a domain name registration website.