Front End Frameworks | Udacity opinion?

Good evening,
Does anybody took this course in Udacity and is it worth to spend time on?
It learns Backbone, Angular, Ember.
I do not know any frameworks yet so I want start this alongside with FreeCodeCamp libraries part.

fcc teaches mern stack, mongodb + express + react + node, react there basically has the same functions as angular, as i understand it

apparently non beta fcc doesn’t have much stuff about react though except the practical tasks