Tell HN: Don't learn more than you need to know
But most people waste it, and waste it in ways they think is not wasting.
For example, most people don't consider learning more than you need to know a bad thing! Because learning is good, we don't consider over-learning bad!
I think over-learning is as bad as not knowing anything. Both is wasting time!
Information in this world is infinite and our time is finite so it makes most sense to only learn the most important things that we need to know right now -- not in the future but right now!
Now, someone might argue that learning more than we need to know gives us perspective to see what we need to know next, or gives us big picture or our next idea or some other crap to usually justify a 400 page textbook on world economy for someone with no interest.
Well, if you have no perspective or you think you need to know more in order to make a better decision you still don't know enough. In that case you need to learn more but not more than that because soon you have no time to learn anything!
Don't over-learn!