After learning the languages, do you think it's time for frameworks to learn?

Question

Angular, React, Bootstrap, Zend, ...?

Answer 1

yes

Answer 2

Bootstrap will help you build faster and maybe better websites.

Angular and React (Meteor, Node, Ember, Vue...) are JavaScript. If you are good at JavaScript (Vanilla) you'll learn them quick and you'll be able to develop Web & Mobile apps.

So YES is the answer to your question.