First-Generation Managed Packaging Developer Guide

First-Generation Managed Packages
Why Switch to Second-Generation Managed Packaging?
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
Enable Dev Hub and Second-Generation Managed Packaging
Limited Access License for Package Developers
Add a Limited Access User to Your Dev Hub Org
Link a Namespace to a Dev Hub Org
Scratch Orgs and Package Development
Scratch Org Allocations for Salesforce Partners
Manage Scratch Orgs from the Dev Hub Org
Supported Scratch Org Editions for Partners
Build and Release Your App with Managed Packages
Packaging Checklist
Deploy the Package Metadata to the Packaging Org
Create a Beta Version of Your App
Install the Package in a Target Org
Create a Managed Package Version of Your App
View Information About a Package
Components Available in First-Generation Managed Packages
Behavior of Specific Metadata 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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Scratch Orgs and Package Development

Scratch orgs are a source-driven and disposable deployment of Salesforce code and metadata, made for developers and automation. A scratch org is fully configurable, allowing developers to emulate different Salesforce editions with different features and preferences.
Available in: Lightning Experience
Available in: Developer,Enterprise, Performance, and Unlimited Editions

You can use a scratch org to develop the app you want to package, and you can also create scratch orgs to test out your package. Scratch orgs also help with continuous integration (CI) processes to automate package development steps. For example, you could write a script that creates a package version, creates a scratch org, installs the package version in the scratch org, runs Apex tests, and emails the test results to the release manager. For more information on scratch orgs, see Scratch Orgs in the Salesforce DX Developer Guide.