Can't figure out how to create a generic (isomorphic) React web app =>?

Question

React

Made the first React application
Now I'm trying to make it isomorphic (first rendering on the server).
But I can't figure it out. In addition, I do it with [email protected] - so far there are few materials on it.
That non-working application is here
I would be very grateful if you explain, help me figure it out.