SEO is a pretty complex topic. If you go to the bottom of the Indiemade home page and search SEO, you'll find a half dozen articles we've written on the subject. I suspect what's confusing you is the fact that a lot of people say meta tags aren't important any more and that's true for Google. Google's a pretty smart search engine, so using plain language with keywords in your title is all google needs to figure out what you're selling. Google isn't the only search engine, so people use meta tags to cover their bases.
Does that help?