As I'm not a full-time developer, I mainly encounter Node.js via npm library installs, rarely developing or modifying it directly. I'd thought I understood JS scripting to some extent, but it became a time to re-organize Node.js's async approach and how npm libraries truly operate at lower levels. So much I didn't know! It was a good time; examples helped me easily grasp parts I'd simply overlooked without logic comprehension. I'll quickly summarize and proceed; areas I didn't grasp need several more detailed reviews. I recommend this good lecture.