10. Google Maps API key
As of June 22, 2016 Google has started to require an API key to use Google Maps on your site. Don't worry as this is still free. You just need to register with Google and get a free API key. Then paste the key into our theme.
Step 1) Register and get an API Key here: https://developers.google.com/maps/documentation/javascript/get-api-key
Step 2) Login to your WordPress site and add your API key into your theme customizer. (Appearance > Customize > Google Maps)