[bcherny]

That's what the "Concepts" section is for. Those questions are designed so that you can keep going deeper for people that know the concept. At some point everyone bottoms out, but it's a different point for everyone. Eg.

    "What is the event loop?"
    "It's how JS does async"
    "How does it work?"
    "There's a stack and a queue managed by the platform"
    "How else could you design that?"
    "Other languages have threads"
    "What are the tradeoffs between evented I/O and threads?"
    "Memory safety and programmer error, CPU/memory utilization"
    ...