Note that you will need to be in the aura directory to create a Lightning Application or component. If you do not have one, create a directory named aura in the <app dir> | main | default.

Hence, let's cd into the aura directory using the command-line utility:

To create a simple Lightning app named TestApp, execute the following command:

sfdx force:Lightning:app:create -n TestApp

The following screenshot shows the files that were automatically added to the local folder once the preceding commands had been executed:

Along similar lines, to create a component bundle named Testcomponent, execute the following command in the aura directory:

sfdx force:Lightning:component:create -n Testcomponent

The following table summarizes the commands available to create Lightning Components, Lightning Application, events, and interfaces: