- HTML to JSX online compilers are already available
- Major changes with Reacj compared to 4 years old react
- Prefer Hooks to Mixins, Mixins are no-longer popular to share
- import {render} from 'react-dom'
- make use of 'create-react-class' module instead of React.createClass, which is outdated and deprecated rather
- import PropTypes from 'prop-types' (PropTypes was part of 'react' module)