React - The Fundamentals of High Performance React

components enable you to not copy and paste it but to encapsulate. It's looks and behaviors into something that you can just plop into a larger component. You can create a button component and reuse that component without having to recode it or understand how that button component works internally. So these are things that I think are very tightly tied to components, or at least they should be if you want to take advantage of the strengths of react.