021 -
https://projects.wojtekmaj.pl/react-lifecycle-methods-diagram/

021 -react
https://reactjs.org/docs/state-and-lifecycle.html#adding-lifecycle-methods-to-a-class

022 -higher-order-components
https://reactjs.org/docs/higher-order-components.html#gatsby-focus-wrapper

023 Github-recompose
https://github.com/acdlite/recompose

023 -memo
https://reactjs.org/docs/react-api.html#reactmemo

024 -errorBoundary-codepen
https://codepen.io/gaearon/pen/wqvxGa?editors=0010