Learning a new language is hard, whether it's a spoken language or, in this case, the incantations on command line.

Your comment to which I'm replying now shows that you do have the ability to learn this new language. You've correctly and successfully used the term "SO" to refer to a popular resource on programming. You have successfully "fired up the terminal." You've even used the terminal to echo $PATH. You're making great progress! :-)

The particular idea of installing node.js by default in web browsers seems to me like installing toasters on sofas. That would make it easier to make toast without going to the kitchen, but is not something that most people would want.

> why do I need to ______?

This is the current state of computers and programming. Computers are just concentrated piles of logic gates and they don't actually know what they are doing.