The title tag is the most important factor in your on page SEO. Choose the title tag as you wish your site to appear on Google's search results listings. The closer your keyword is to the front of the title, the better.
Make sure that each page on your site has a meta description that gives a succinct summary of the purpose of that page within your site. Accurate and readable descriptions will improve your click through rate.
Search Engine Friendly URL's
Make sure that your site consists only of search engine friendly URLs of the form:
Ensure that all images on your site are size optimized for the web. There are several online tools for image size optimization. Also, make sure the image file names include your keyword and that the image alt-text also includes your keyword.
Social Sharing Buttons
Social sharing buttons and social shares do not directly affect your ranking, but they can potentially create inbound traffic and more eyeballs on your site. This will in turn make it more likely that other sites will link back to yours.