Thanks for checking out Five Minute React! This course was original released in 2017 and is not completely up to date with the latest React hotness (eg: functional components, hooks). The good news is: everything you learn here is still applicable. React still supports all of it, and the code will work just fine. More importantly, you will still gain a really solid foundation in both Express and React, which will allow you to very quickly move to working with all of the new features if and when you want to use them.
Video Updates Document
Some of the text tutorials have changed since the videos were recorded. Most of these are very minor changes, but important ones. This document tells you exactly what's changed (and what code you need) for each video that no longer quite syncs up.
I hope you enjoy Five Minute React!