If you want the answer to that spend a year or two looking at what good pedagogy is preferably with someone who is highly skilled at it.
Right now it's "Every Programmer Combined Should Know"
But who still post that Heinline monologue about how specialization is for insects.
I might not know how to butcher a pig, but I know multiple programming languages, multiple human languages, I ski, I climb, I skate, I ride bikes. I can cook foods from cuisines from all over the world. I read books on things I haven't formally studied.
Life is just more interesting if you're not a one trick insect.
Sure, but it doesn't help you actually decide where the line is between "things which I should focus on learning" and "things which are massive skills that it would take many years to learn and I shouldn't bother." My biggest problem here is with "learn how to plan an invasion".