Best resources for developing a technical understanding of blockchain tech?

I've been interested in the use of blockchain for applications beyond finance for a while now, but, not having a computer science or programming background, am still confused as to what is possible and feasible.

For those of you who have developed a technical understanding -- what resources can you recommend? In essence, what does it take to become a developer - not an expert, but enough to have a functional understanding of the code that goes into, say, smart contracts?

So far I've followed Princeton's Coursera course and am working my way through introductory Python courses, as well as trying to follow posts in these forums.

Do you have any suggestions or recommendations for serious yet accessible material to help develop a deeper understanding of the technical aspects of blockchains and cryptocurrencies?

Thanks in advance for any help!