Several Questions in Front End

  node.js, question

1. How does 1.nodejs count as an introduction, and then how do you learn stepwise?
2. What is the learning stage of 2.js?
3. The complexity of the front-end work is getting bigger and bigger now. Faced with more and more new technologies of various frameworks, how can we learn so as not to put the cart before the horse? To be more systematic and comprehensive?

Keep concise, use on demand, foundation is very important, computer foundation, mathematical foundation, algorithm foundation, data structure foundation