Use the deploy command to deploy files to production or your packaging Org:

sfdx force:mdapi:deploy

To convert the source back to the Metadata API format so that you can deploy it, using execute the following command:

sfdx force:source:convert

The Salesforce SFDX CLI is a great utility and provides a lot of functions to create Apex, Visualforce, and Lightning Components, as well as to create a dataset, to install packages, and to deploy applications. It's out of the scope of this book to discuss each and every command. You can explore every command provided by Salesforce DX in the official document at: https://developer.Salesforce.com/docs/atlas.en-us.sfdx_cli_reference.meta/sfdx_cli_reference/cli_reference.htm.

Throughout the book, we will use Salesforce DX to build and test Lightning Components. Wherever applicable, if we introduce new commands that are not covered, we will highlight them.