@kautif What about it don’t you understand?
It works because it proxies every request made to your site to the /index.html file, basically it returns the /index.html file no matter what URL you access the site via.
So instead of a request to /user/games trying to return a file from /user/games.html (or /user/games/index.html), the proxy causes it to return /index.html at which point the route (/user/games) is handled by your react application… which only exists on that single index.html page.