Matt Stauffer wrote another excellent article on Laravel. This time he gives a tour of Laravel Spark.
In case you're still having a bit of trouble understanding what Spark is really about, Spark is a tool designed to make it quicker for you to spin up SaaS applications, and it handles user authentications, plans and payments and coupons, and team logic. Most SaaSes have these same components: user accounts, Stripe-based payments, and different payment plans. And many have payment coupons and team payment options. Rather than re-creating this functionality with every new Laravel app you create, just use Spark, and you'll get all that and a free SaaS landing page to boot.