If your site ranks highly in search results, make sure that your site is going to do well in a manual review by a site quality rater to avoid a penalty.
Have a clearly identifiable purpose of your site.
Ensure that you have high quality main content on your site.
Ensure that supplementary content is helpful to the visitor such as out-bound links.
Have a great page layout that is way beyond a deceptive layout designed to fool people into clicking on Ads.
Make it clear who is responsible for the content e.g. Author link.
Have a contact page.
Regularly maintain the home page to keep it up to date.