I'm pretty sure the TS means for search engine rankings, if the keywords your trying to rank for are in the domain name or URL, for serps.

While I think it's important, I would be more concerned about backlinks before anything like that. If your website is already going, I'd just continue working on it. If you haven't registered the domain yet, then sure it might be a good idea to get one of the main keywords in the URL/domain.