An SEO (Search Engine Optimization) strategy is important to have and important to invest in, but a word of warning - it doesn't result in immediate sales or page ranking changes.
So how will it help you make sales? Well, a good SEO will help answer (make your page easier to find) what someone types into their search bar. So how you write your SEO and content on your page will be how the search engines find your website and direct people to it. This is why you always hear my colleagues in advertising and marketing tout "Content is King" - we may overuse that phrase, but the next steps after the search engine suggest your page, you need to walk your potential customer through your sales funnel.