Salesforce DX Developer Guide

How Salesforce Developer Experience Changes the Way You Work
Enable Dev Hub Features in Your Org
Project Setup
Authorization
Metadata Coverage
Scratch Orgs
Sandboxes
Track Changes Between Your Project and Org
Development
Build and Release Your App
Build and Release Your App with Metadata API
Develop and Test Changes Locally
Build and Test the Release Artifact
Test the Release Artifact in a Staging Environment
Release Your App to Production
Cancel a Metadata Deployment
First-Generation Managed Packages
Second-Generation Managed Packages
Partner Licensing Platform (Developer Preview)
Unlocked Packages
Continuous Integration
Troubleshoot Salesforce DX
Limitations for Salesforce DX
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Develop and Test Changes Locally

Develop changes in source format, deploying to and retrieving from your Developer sandbox.

These steps provide the high-level work flow.

  1. Create the source control repository.
  2. Create a DX project.
  3. Add the DX project files to your source control repository.
  4. Authorize the Developer sandbox.
  5. Perform development tasks in your developer sandbox.
  6. Retrieve the changes from the developer sandbox. If you have a few changes, you can indicate a comma-separated list of metadata component names. If you have many changes, you can use a manifest (package.xml). 
    1sfdx force:source:retrieve --manifest path/to/package.xml
  7. Commit the changes to the source control repository.
Next: Deploy all changes the team has made to the Developer Pro sandbox, then test those changes.