Building an one page app: framework choice

I have a client needs a web app with a one-page homepage, as well as user system and database. Something similar would be https://www.chegg.com/

I plan to use Rails as backend. What would be the ideal javascript framework for the one-page homepage? I know there're things out there like backbone, angular, ember, bootstrap etc. I don't have experience with any of them. Which one would you recommend considering easy to pickup and documentation available? The priority is to get the job done.

Thanks!