Today I will tell you what are the important things every React.js beginner should know.

But before we begin let just quickly understand what is React.js

React is an open-source JavaScript library that is specially designed for building user interfaces for single-page applications. React.js is very famous for the development of front-end web applications. React also allow users to create reusable UI components. It is developed by Facebook and maintained by a community of developers and companies.

Before we start with explaining about things which beginner should know, I would like to tell that if you are beginner or pro developer in react, there are react templates available in market, which can help you out to complete your project much faster with its ready to use designs and components. So do check them out. Now let’s start!

1. React is a library, not a framework.
React is not a framework or MVC (Model view controller) framework it’s just a library. React allows developers to create large web applications that can change data in real-time without reloading.

2. Always try to keep your component small.
Every developer with good knowledge knows that small components, classes, and modules are easier to test, understand, and maintain. The extra size of the component depends on many different factors including your team preference. But in general, try to keep your component small.

3. Use the Redux library for state management.
Redux is an open-source library it is one of the most famous libraries for front end development.
Redux is a state container for JavaScript applications. It is commonly used for managing application state.
Benefits of using Redux.

• Predictable state update helps to understand how the data flow works in the application.
• The use of reducer functions makes testing of logic easier and enables useful features like time-traveler debugging.
• React-Redux provides the advantage of maintaining state.
Few more libraries complement very well with Redux.

• Reselect
• Immutable.js

• Redux-thunk
You don’t have to use all of these libraries when you just starting. Use immutable when you have a state. Use reselect when you have derived state and use thunk as you have routing and asynchronous action.

4. Write stateless components.
The state makes components difficult.
We have to work a lot harder mentally to read a code of a state component to minimize it ask yourself some questions like, what if I change this state? Has that state been initialized yet? Is there any race condition in the state? Checking the state component is very painful.
The state makes components difficult to test.
To test the stateful component we need to get our components into the right state. And to test their behavior we also need to use all various combinations of state. When components are just functions of input, then testing becomes a lot easier.

5. Use the Redux dev tool.
The react dev tool helps you to inspect rendered React elements. Which is very useful to watch how things will look in a browser. The Redux dev tool is very powerful they let you see every action that happened. You can use it as a dev dependency or as a browser (Chrome, Mozilla) extension.

So, that’s all from my side. I hope you got the idea about the things every react beginner should know.
If you still have any confusion or doubt, then please let me know in the comment. I will be happy to help you.

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