Salesforce Apex Language Reference
First things first !
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If you need more information about the implementation guide, you can read the Table of Contents below.
Apex Developer Guide
Getting Started with Apex
Apex Development Process
Apex Quick Start
Data Types and Variables
Control Flow Statements
Classes Objects and Interfaces
Working with Data in Apex
Apex Transactions and Governor Limits
Using Salesforce Features with Apex
Integration and Apex Utilities
Debugging Testing and Deploying Apex
Distributing Apex Using Managed Packages
Shipping Invoice Example
Documentation Typographical Conventions