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this.setState({}) -> updates the state 


lifecycle methods:

JS::
better to use than componentWillMount
constructor() {super()} -> once component creates itself 


Recact Based::

componentWillMount() { } -> before component mounts (renders)

componentDidMount () { } -> component just rendered
// trigers a re-render
// add dynamic data from an endpoint (not to block the entire app)
// is this sync???



refs:: access dom elements on events
ref = (input) => this.input = input

2 way binding react
onChange set a function that updates the state



propTypes setting the types of the props