> If you just move from Angular to React or whatever other thing is hot right now every year for 20 years but don't understand what fundamentals they are based

> If you just move from Angular to React or whatever other thing is hot right now every year for 20 years but don't understand what fundamentals they are based on That person would have to be (and remain so for 20) spectacularly, blissfully, implausibly obtuse ... given the minimal cognitive capacity needed to hop from each of the 20 upcoming Angular/React equivalents to the next every year will likely both suffice and entice to "osmotically absorb" said "fundamentals" behind them all over time, even when never spelled out. I think quite a few of us grasp the principles of this or that tech first informally by trial/error and experimentation, later when reading "the spec" or the "fundamentals book" or whatever always flip-flopping between "I know, I figured it out the hard way, smart me hehe" and "I know, I know, tell me what else is new!!"