What's the situation with React versions?

Question

React

All the time I sat on Angular, now I hung up to study and React.
Everything is simple with Angular, there is an old version 1, there are 2-4 where from version 2.0 everything is practically 99.99% compatible with the latest one.
What's up with React? Here https://facebook.github.io/react/ version 15.6.1 is on which version is everyone mostly writing on? How big are the compatibility issues between versions? How often are versions released? What version should I start studying with the expectation that I will add react to my resume in 2-3 months?

Answer 1

Latest stable - 15.6.1
Everyone is waiting for the major release of the 16th version
There are no compatibility problems, start with the 15th and pay attention to the things that will be turned off next. versions: PropTypes not from package 'prop-types', createClass