React-Bootstrap is a library that can handle Bootstrap as a component of React.js.
By using this you can build code with a sense of combining React.js components, not Bootstrap’s CSS.
Also, as a whole your code becomes clearer, maintenance costs are suppressed as well!
This article describes how to start React on Rails.
This article describes React.js tips & useful componet for beginner.
This article describes React.js on ES6+ tips for beginner.