Keep your website platform and server patched with the latest security updates. For websites we host, we monitor hacking efforts and typically see dozens of hacking attempts every day using known vulnerabilities. CMS (eg. WordPress, Drupal, Sitecore) and e-commerce systems (eg. Magento, Woo Commerce, Open Cart) have bugs and vulnerabilities that need to be patched regularly to keep them safe from hackers. Check with your web hosting company to ensure that they regularly patch their servers. If you run your own server, you can install patches yourself.