Lightning Aura Components Developer Guide

What Is the Lightning Component Framework?
Quick Start
Before You Begin
Trailhead: Explore Lightning Aura Components Resources
Create a Component for Lightning Experience and the Salesforce Mobile App
Creating Components
Using Components
Communicating with Events
Communicating Across the DOM with Lightning Message Service (Beta)
Creating Apps
Styling Apps
Developing Secure Code
Using JavaScript
Working with Salesforce Data
Testing Components with Lightning Testing Service
Debugging
Performance
Reference
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Trailhead: Explore Lightning Aura Components Resources

Get up to speed with the fundamentals of Lightning Aura components with Trailhead resources.
Whether you’re a new Salesforce developer or a seasoned Visualforce developer, we recommend that you start with the following Trailhead resources.
Aura Components Basics
Use Aura components to build modern web apps with reusable UI components. You’ll learn core Aura components concepts and build a simple expense tracker app that can be run in a standalone app, Salesforce app, or Lightning Experience.
Quick Start: Aura Components
Create your first component that renders a list of contacts from your org.
Build an Account Geolocation App with Aura Components
Build an app that maps your accounts using Aura components.
Build a Lightning App with the Lightning Design System
Design an Aura component that displays an account list.
Lightning Data Service Basics for Aura Components
Read and modify records in your components.