Ask HN: What are some good resources to learn about embedded software and EE?

With the purchase of my 3D printer and some other fun electronic gadgets, I've been getting more and more curious about electrical engineering and the embedded software world. My day to day experience is mostly limited to web dev TS/Go, so a very different world. My C++ skills don't go much beyond Uni entry level.

Are there any good resources for a beginner to get some more insights into that world? (blogs, books, MOOCs, etc.)