https://selleo.com/blog/why-and-how-to-migrate-a-react-application-to-next-js
client-side routing is optimized with prefetching
1. Create a Next app
2. recreate your routes
create your route structure using folders and file names inside `pages` directory
( you can use dynamic routes )
3. move your components to the new project
the suggested way is to put them in components folder in the main directory
4. plug in your styles
import your main stylesheet in `_app.js`
(version of Next.js > 9.3 have built-in support for SASS/SCSS)
5. take advantage of static / SSR pages
move all of your data fetching to one of the functions: getStaticProps, getServerSideProps
-> getStaticProps : should be used on those routes that you want to be rendered at build time and served as static. If you want to use it on a dynamic route you should also use getStaticPaths.
-> getServerSideProps : is to be used on those routes that you want to generate on the server.
assets: see next article
data fetching logic is the different of these two project type
Libraries that need access to the window
conditionally load the library after the component was mounted (useEffect or componentDidMout)
