It's all about the common sense. Thing that I'm trying to say is, use meta tags like a normal person would use them, don't put in them something that's not on your website. Don't use keywords that have nothing to do with your website, and more importantly make your website user and search engine friendly.
If it loads fast, contains your content, and if the content is easily readable, your site is "optimized".
Think about the site itself, and then about the backlinks.
