This course is a beginner's gateway into the mechanics of using Redux as an application building platform. It takes a bottom-up approach, enforcing the basic aspects of Redux before incorporating them together in a creative and interactive way. It begins with a short theoretical section before moving on to application based problems. 
The course does assume that the user has a basic idea of how React works, as Redux works in the React environment. Let's dive in!

Understanding Redux: A Beginner's Guide To State Management

When returning state from reducers, there’s something that may put you off at first. 

However, if you already write good ReactJS code , then you should be familiar with this already:

>You should not mutate the state received in your Reducer. Instead, you should always return a new copy of the state.

Technically, you should never do this:

A reducer should never be allowed to alter the state of the app. We'll see the correct way to handle the state below.

Getting to know Redux (Theory)

Your First Redux Application

Understanding State Updates with Actions

Building Skypey: A More Advanced Example

Building Skypey: Designing the State Object

Building Skypey: The User Component

Building Skypey: The Empty Screen

Building Skypey: The Chat Window

Building Skypey: Header and Chat Window

Building Skypey: Messaging

The Skypey App

Returning the State from the Reducer