First-Generation Managed Packaging Developer Guide

First-Generation Managed Packages
Why Switch to Second-Generation Managed Packaging?
Move to 2GP: Migrate Your Managed Packages with Ease
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
Behavior of Specific Metadata in First-Generation Managed Packages
Package and Test Your First-Generation Managed Package
Install a Managed Package
Install First-Generation Managed Packages Using Metadata API
Component Availability After Deployment
Install Notifications for Unauthorized Managed Packages
Resolve Apex Test Failures
Run Apex on Package Install/Upgrade
Run Apex on Package Uninstall
Uninstall a 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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Component Availability After Deployment

Many components have an Is Deployed attribute that controls whether they’re available for end users. After installation, all components are immediately available if they were available in the developer's organization.

Installed packages are available to users in your organization with the appropriate permissions and page layout settings.