When choosing a domain name think carefully of what you want to be doing long term. A domain name should one that is easily remembered and can easily be searched for using various search engines. Ideally a domain name should reflect the “brand” which again makes it more recognizable. A well named (branded) domain will add value and be much more profitable if/when sold.
hey @Romon to select a best domain you should choose a domain including keywords. If you are going to book a domain fo tech related blog or site, then you can choose domain which includes tech or techno word. Also, try to short domain name and one which will easy to remember for users. Also don’t take numerical digits in your domain.
I would like to mention one more thing here that selecting domain with keyword is very beneficial because sometime when users search for queries in search engines then search engines highlight and bold the matching keywords, which are good symbols for seo too. 