This post demonstrates how to sync your code and configuration changes between SFDX Project and Scratch Org.
This post demonstrates how to create an SFDX project, a scratch org and how to sync across project, scratch org and Git.
This post explains and demonstrates the steps to get started with SFDX.
This blog post talks about SFDX and its relevance in Salesforce. SFDX is the same as Salesforce DX.