Google's Primer app is I think a good example of interactive learning. The approach isn't much different to other virtual courses, but the way the information is organized into bookmarkable cards is nice.

It could form the basis of the entire site, a Tinder style swipe-until-you-find-the-course-you-want initial discovery flow followed by a course flow structured into cards.

You could even go further and structure each course like an adventure game. Make choices and if you answer incorrectly you discover at the end by getting a poor conclusion.

Making learning into a game would introduce positive reinforcement as well, it could make learning addictive (in the best sense of the word).

Socialise the platform by allowing users to bookmark courses and have their selections browseable by other members, Tinder style again, swiping through a user's favourites.

Never stop learning is key, however, variety is the spice of life. Naturally, most people don't have the 10k hours anything needs to become world class. For subjects, you do want to go deep, look up DISSS and CaFE made popular by Tim Ferriss in the 4hour cookbook.

Dive in head first. Don't understand the subject at all. Get frustrated. Google and jump to answers found. Frustrated because the answer found was too old. Feel like I'm not getting anywhere. Finally make some progress. Discover familiar patterns. More progress. End up being pretty good at it.

Still feel it all took to long because everything changed and now you need to learn something new.

Specific to development- I am a big fan of pluralsight. I have done hours and hours in courses on various topics and I think it's the best way to get going on something new for me.

That's awesome! My friend's father recently becme CFO of pluralsight actually

Agreed! It's a great service, with quality content.

Coursera, Udacity, etc. Additionally, books, and stack overflow for examples if lacking.