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I think it is also better if you use keyword as your domain name but make sure that it is unique so that it is easy for you to optimize it in search engine.

Yes it is really helpful if you add keywords in the domain name itself

You get fastest ranking for your website if you have keyword in Domain with help of seo

I you use keywords in your domain name there are high chances to rank your site for that keyword, you domain should be according to your business.