Apex Developer Guide

Apex Developer Guide
Getting Started with Apex
Writing Apex
Running Apex
Debugging, Testing, and Deploying Apex
Debugging Apex
Testing Apex
Deploying Apex
Using Change Sets To Deploy Apex
Using the Force.com IDE to Deploy Apex
Using the Force.com Migration Tool
Using SOAP API to Deploy Apex
Distributing Apex Using Managed Packages
Apex Language Reference
Appendices
Glossary
PDF

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Deploying Apex

You can't develop Apex in your Salesforce production org. Your development work is done in either a sandbox or a Developer Edition org.
You can deploy Apex using:

Any deployment of Apex is limited to 5,000 code units of classes and triggers.