Hi!

The following sections in this course show how to work with an older version of React and React Router.

Why is this content still here?

Turns out that many companies got started with React years ago, and use an earlier version of it.  Many of these companies have decided to continue using those older versions, rather than spend the time and resources to update.  Either way, they still need engineers who understand these older versions!  That's what these videos are here for: helping these companies train employees on how to work with legacy versions of React.

Do I need to watch these videos?

You only need to watch these videos if you think that you will be working on a project that involves an older version of React or React Router.  Otherwise, you can skip them for now.