alt Hacker News> Mild counterpoint. Our professions(all things IT) moves bloody fast.
Some areas do, some areas not so much.
I have a colleague that's incredibly strong with databases (we use a mix of MySQL and PostgreSQL) and he's living off the learning he did 20 years ago when he was a junior Oracle consultant.
I live off the learning I did in Linux now that I administer Kubernetes clusters for a living. Once you get past the "cloud native" abstractions (and other BS) it's penguins all the way down, and I get to reuse most of my core Linux competencies I learned 10+ years ago (eg: I do tcpdump in prod, and it's quicker and more effective than many of the modern shiny tools).
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> Some areas do, some areas not so much.
It still does change and you have to adapt.
E.g.
> databases (we use a mix of MySQL and PostgreSQL) and he's living off the learning he did 20 years ago when he was a junior Oracle consultant
And there's lots of changes here, e.g. vector stores, all the different query engine improvements, PostgreSQL IO improvements, etc and they all may impact your job. Your optimal query back then might not be the same. Living off the old learnings is like taking a 50% discount on the max potential.
> I live off the learning I did in Linux now that I administer Kubernetes clusters for a living.
And these have had changes consistently too e.g. io-uring and gateway api. You can only be in legacy for so long.
For udemy classes though it is hard to know what is timeless knowledge vs what is outdated crap starting out.
That is why there isn't much else to go but the heuristic of the most new class with the most ratings.