I have just been alerted to a comprehensive set of videos and other online resources which have just been released by Elegant Themes (the people who develop the Divi WordPress Theme).
If your site is based on Divi (if you don’t know it probably isn’t, but check with me), you can access these tutorials to learn about how you can get the most out of your website. Do bear in mind, I have not seen them all, or used all of the whistles and bells in this template, so there are bound to be things in here, I have not used.
The link to the document is here: https://www.elegantthemes.com/documentation/divi/
Update 19/01/18
New set of comprehensive help direct from Elegant Themes for Divi users can be located through here: Divi Helper Announcement this includes access to 70 videos.