This document provides an overview of modern development with Salesforce DX. It discusses using source control and metadata with scratch orgs and the Salesforce CLI for source-driven development. Visual Studio Code is highlighted as an IDE for Salesforce development with features like the Salesforce extension pack. The document contrasts traditional org-based development with the new paradigm of package development where changes are tracked relative to package versions. It demonstrates these concepts with a live demo and encourages attendees to learn more on Trailhead.