Do you have any 'in-depth' advanced YouTube tutorials about custom features such as injecting CSS?

Secondly

Do you have any 'in-depth' Advanced youtube tutorials going into detail about how to use the custom features such as injecting css and the capabilities of the 'Advanced Designer'. I have no coding experience and i find myself bumbling around the forums constantly trying to work out how to use it (which is an extremely time wasting method of learning).

Yes we do. Please check https://www.youtube.com/user/TheJotForm/videos

Please feel free to suggest anything about the content. Your feedback is most welcome.