How to use static custom label in Salesforce lightning component?

Hello,

Use the following syntax to access custom labels in Aura components.$Label.c.labelName for the default namespace
$Label.namespace.labelName if your org has a namespace, or to access a label in a managed package
You can reference custom labels in component markup and in JavaScript code. Here are some examples.Label in a markup expression using the default namespace
{!$Label.c.labelName}  .