Make sure your website is optimized for Desktop, Tablets and Mobile. Over 50% of all people who surf the web do so on mobile devices. Additionally Google’s algorithm penalizes websites that are NOT mobile friendly. Do a quick test with tools like Screenfly.

Make sure your website has a content management system (CMS). Being dependent on a developer to update the content on your site can get expensive and worse, should something happen to them, from a bad business experience to moving on to greener pastures, you may find yourself with a site that is virtually impossible to change.

Make sure your site works on all major browsers. Use tools like BrowserStack to check compatibility.

Make sure there are no broken links on your site. Use tools like LinkChecker and Google Webmaster Tools to check the health of your site.

Make sure your website loads quickly. Tests at Amazon revealed that every 100 ms increase in load time of Amazon.com decreased sales by 1%. Google found that moving from a 10-result page loading in 0.4 seconds to a 30-result page loading in 0.9 seconds decreased traffic and ad revenues by 20%.  Additionally, trends are favoring big images, video and content management systems which will slow things down. Fortunately there are tools like Pingdom, to check how you fast your site is and help you make adjustments so you can be the best that you can be.