Everything is components and elements

- [Instructor] When you're writing JavaScript with React … pretty much everything is a component, … and those components are made up of elements. … In this video we'll talk about … what might interest us about components. … Components are the building blocks of a user interface … at whatever level of granularity you think is appropriate. … You'll usually have one big one containing everything else, … and then it's up to you to figure out … what the others should be within that. … Defining a React component … means writing a function or a class. … We'll look at which you'll use in more detail later, … but for now, functions are simpler and lighter, … also a little less powerful. … Classes can do everything that React supports, … but are a new feature of ES6, … so you might need a polyfill called create-react-class … to help you with this. … To get started you can usually just work with functions … and then enhance them as you need to later. … Components are meant to be reusable … by you for certain, and maybe by others as well. …