Most of my time these days is learning about domains, not technical skills. I keep programming books around for references, but the books I read most are books that go deep into some domain, either technical like operating systems or network, or soft skills like planning, design and communication.
It’s kinda the old saying about $900/hr expert that only taps with an hammer. The price is not about tapping, it’s about knowing where to tap.
It happened fast, as you prompted it just the right way. Another person, who doesn't have all that context in the mind, would fail quickly.
For example I have decades of Software experience, but wont know where to even begin what OP did.