There is an awesome short video offered by freeCodeCamp that helps in breaking down concept of Redux for newbies.
Please check that out here: https://www.youtube.com/watch?v=oD3miHerQbY.
I have attached associated Codepen:
My version: https://codepen.io/tpkahlon/pen/rNOMQJy
Author’s version: https://codepen.io/VimGirl/pen/eGajxX
Hope it helps!