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Avoid getting stuck. Keep it current. Be professional. Make sure it's readable. Keep it short. Be memorable. Choose something that's clearly you. Use Google's tools. Avoid copyright issues.
Did you find out that the domain name you wanted was already taken? Are you wanting to be sure that your domain name is optimal for people to find your website? You'll want to practice a few simple steps to get the name just right, rather that getting stuck and giving up or taking a less than great name. Choose a domain name that sounds current, and not like something out of the 90s or 00s. Avoid using numbers or letters for words (2, 4, U, etc), or other dated language. Choose a name that sounds professional and legitimate. Unless you want to be mistaken for a porn site or a scam, choose a name that sounds professional. For example, don't name your travel website Travel4U.biz and instead go with something like QualityTravel.net. The domain name should be easy to read. Avoid names that are made up of multiple words with the same letter or letters that look the same, such as wikihowworld or wikiliki. On many computers and print media, these will be difficult to read correctly. Shorter domain names are better, as these are easier to read, type, and remember. However, if your website can be easier to remember or stand out more at wikiHow.com, rather than wHow.com, then don't worry about it. If someone is going to learn about your website by word of mouth, you'll want it to be something that's easy to remember. This is why it's best to name it after your business or after yourself (if it's something like a portfolio site). Tie your domain name to your brand rather than your product. This will help people find you more easily and be easier to remember. It can also cut down on the price of your domain. For example, wikiHow.com is better than GoodInfo.com. Maximize SEO (search engine optimization) by taking advantage of Google's tools, like Google Trends and Google Keywords. They can help you find easier searchable or more commonly searched alternatives, as well as provide expected search numbers. Don't name your site in a way that could become a copyright issue. That's a whole nightmare that you don't want to deal with. Don't confuse the terms with common intellectual properties or make it something that might be abusive to someone's copyright. For example, naming your website DisneyMovies.com or PedoMickeyMouse.com is probably a terrible idea.