1. Make a dummy email account.
2. Subscribe like a madman to cool brands that look like they're not stuck in the 90s.
3. Open their emails, study and compare the code.
For both Landing Pages and Email, I'd recommend looking into some kind of framework to work with. I like Bootstrap for Landing Pages, that's a pretty safe bet if you wanted to be able to put some more advanced things into play and then work your way back to understanding how they piece together. For email (IMHO) there's not as much of a clear winner in terms of a framework that I'd recommend -- lots of folks are using the "Fab4" framework but I'm not a fan.
One thing to note w/ learning email code is that it changes OFTEN! Get your running shoes on - just as soon as you've spent a few months getting to the bottom of something crazy that Outlook and Android can't agree upon, something changes in one of the 50+ email clients and you're back to square one -- but if you like a new challenge all the time, this might be right for you, there's always some discovery to be done. I also agree with Sanford here -- unless it's something you want to stay up on, a "little email know-how" isn't going to last as long as a "little LP know-how" might these days.
All that said, there are way more rules and things to think about (in terms of the front-end) with Email and far more limitations in HTML/CSS so it's like a "subset" of what you'd be able to safely deploy for a LP. For me, this was a bit frustrating at first b/c I learned email after webpages and found that I couldn't code things the way I was used to. This pushed me to dig a little deeper into what I didn't know and the more limited "code set" (i.e. tabled design) of email actually became a kind of refining process for me, and that in turn helped me to write better code for webpages. If I could do it all over again, I might learn the basics of Email first -- I think the limited availability of "cutting-edge" technology is a good place to build a foundation and then enhance those techniques for building more sophisticated webpages.
I've used https://www.codecademy.com/ in the past (it's been a while) but I remember that being a nice platform to learn some basics (language) on.
If you end up checking out Bootstrap: https://getbootstrap.com/docs/4.0/getting-started/introduction/ you can also find a bunch of different tutorial-style video on YouTube to help out there.
For email stuff, I got the most value out of the Litmus Builder by "learning-by-doing" and taking good notes. The downside we discovered to this tool is that they charge "per preview" and when you're testing for 40-50 ESPs at a time, this can add up quickly. I got a ton of ideas from google searches and reading thru forums and blogs on Litmus and Email on Acid also, it might be helpful to poke around their resources for some context.
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