Hey Erik, In the same boat! I've take the free classes at Codecademy and some from Coursera and they both helped me learn more about basic HTML. However, creating Marketo templates that are responsive and work in most ESPs is a whole different ballgame. I've learned the most from taking free email templates (Litmus has great ones as they are already styled to render correctly) and trying to convert them to Marketo templates using Marketo resources and Jenna Mobly's tutorials. http://jennamolby.com/10-things-you-should-know-about-the-new-marketo-email-editor/ is a great place to start. I've found it to be a slow process but have learned quite a bit. Definitely share any resources you find!
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