import React from 'react';

createFactory
createElement

React.DOM
    .li(...)
    .ul(...)

import ReactDOMServer from 'react-dom/server';

ReactDOMServer.renderToString(ReactElement);
ReactDOMServer.renderToStaticMarkup(ReactElement);


types
ReactNode
    ReactElement
        virtual representation of a DOMElement
    ReactText

ReactFragment
    array of ReactNode-s

2019
https://habr.com/ru/post/459380/
https://habr.com/ru/post/459378/
https://habr.com/ru/post/459272/