Lightning Components Developer Guide

What is the Lightning Component Framework?
Quick Start
Creating Components
Using Components
Communicating with Events
Creating Apps
Styling Apps
Developing Secure Code
Using JavaScript
Using Apex
Lightning Data Service
Testing Components with Lightning Testing Service
Debugging
Performance
Reference
Component Library
System Tag Reference
PDF

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Reference

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Note that the the Lightning Component framework provides a subset of what’s available in the open-source Aura framework, in addition to components and events that are specific to Salesforce.