Well, with any large, complex system, you have to learn enough about everything to know what not to use. I have been developing applications of many types for decades and it seems every time I look at react (I am responsible for one production react app that I did not write) it seems there is some new major change on how to approach the entire framework...it's daunting. And with all the constant changes to the main underlying technologies (HTML, CSS and JavaScript), it's even more so...