I started learning ReactJS to learn core concepts I developed a basic counter app by following a basic crash course on ReactJS by a channel "Programming by Mosh" link of the video: https://www.youtube.com/watch?v=Ke90Tje7VS0

• App GIF Demo

I highly recommend this tutorial if you are new to ReactJS to learn all-important core concepts do follow this tutorial and build the application.

In this tutorial, I learned the following concepts and built a basic application as shown in this video to practice on concepts.

• What is React
• Setting Up the Development Environment
• Components
• First React Component
• Specifying Children
• Embedding Expressions
• Setting Attributes
• Rendering Classes Dynamically
• Conditional Rendering
• Handling Events
• Binding Event Handlers
• Updating the State
• What Happens When State Changes
• Passing Event Arguments
• Composing Components
• Passing Data to Components
• Passing Children
• Debugging React Apps
• Props vs State
• Raising and Handling Events
• Updating the State
• Single Source of Truth
• Removing the Local State
• Multiple Components in Sync
• Lifting the State Up
• Stateless Functional Components
• Destructuring Arguments
• Lifecycle Hooks
• Mounting Phase
• Updating Phase
• Unmounting Phase