Select a short, easily spelled and remembered domain name. If at all feasible, stick to one or two words.
Incorporate keywords related to your business for better SEO and searchability.
Stick to letters only. Numbers and hyphens make your domain harder to remember and type.
A memorable domain name that is closely associated with your brand is what you want to choose. This sets your brand apart from the competition.
Avert legal problems by making sure your domain name does not violate any already-existing trademarks.
Choose a.com extension whenever you can because users are most familiar with and trust it.