Here are a couple videos to help you get started with the basic building blocks on working with React and Redux, without the barrier of TypeScript.
React & Redux
- 1 to 15, then optionally 21
Complete React Tutorial (& Redux ) #1- Introduction https://www.youtube.com/watch?v=OxIDLw0M-m0
Watch episode 34 to 44
Complete React Tutorial (& Redux) #34 - Introduction to Redux https://www.youtube.com/watch?v=HKU24nY8Hsc
Watch episodes 3, 11-17,
React, Redux & Firebase App Tutorial #3 - Setting Up https://www.youtube.com/watch?v=r5b0spRlnlU
Picking up Rematch is pretty easy with the additional content linked.