First-Generation Managed Packaging Developer Guide

First-Generation Managed Packages
Why Switch to Second-Generation Managed Packaging?
Set Up Your Environments for First-Generation Managed Packages
Developer Hub
Environment Hub
Register a Namespace for a First-Generation Managed Package
Create a First-Generation Managed Package Using a UI
Create a First-Generation Managed Package using Salesforce DX
Components Available in First-Generation Managed Packages
Package and Test Your First-Generation Managed Package
Update Your First-Generation Managed Package
Publish Upgrades to First-Generation Managed Packages
Manage Licenses for Managed Packages
Manage Features in First-Generation Managed Packages
AppExchange App Analytics for First-Generation Managed Packages
Developing and Distributing Unmanaged Packages
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Set Up Your Environments for First-Generation Managed Packages

The Dev Hub and Environment Hub are essential to your package development workflow.

Dev Hub

To create and manage scratch orgs, first set up a Dev Hub. A scratch org is fully configurable, allowing developers to emulate different Salesforce editions with different features and preferences.

Environment Hub

Use the Environment Hub to connect, create, view, and log in to Salesforce orgs from one location. If your company has multiple environments for development, testing, and trials, the Environment Hub lets you streamline your approach to org management.