Mixed Content Error occurs when the website data is loaded on both HTTP and HTTPS Connection. It can also be due to incorrect configuration of HTTPS/SSL settings.
502 bad gateway error is an HTTP status code that appears when the internet server does not receive a valid d response from another server.
The first thing to do to get to the root of the problem is to see if it is your web browser’s fault or WordPress itself.
The forbidden error shows that the page that you are trying to access is not in reach and is forbidden.
Depending on what causes the problem many things could have gone wrong resulting in your website failing to be displayed and all you get to see is a white screen.
The Conditional Tags allows the developers to manage what and how the content is displayed on their website.
It has been demonstrated that a speed of more than 2 seconds appears in about 47% of visitors looking up the website. Meaning, in order to keep about half of your visitors coming but also interested, you have to work on speeding up your WooCommerce store.