Front-End is where I've spent most of my time, but see that there's more talk about full-stack than there is of either Front-End or Back-End these days. I'll look into the MERN stack, since I've seen mention of that too.

Regarding APIs, consumption is one thing that I'd like to learn, but also development of them. I've yet to work with anything that would necessitate the development of an API, but have worked with consumption some--though nothing fancy.

Thank you for sharing the link. I look forward to studying.