Many of the Learn exercises use a technology called the sandbox, which creates a temporary subscription that’s added to your Azure account. This temporary subscription allows you to create Azure resources during a Learn module. Learn automatically cleans up the temporary resources for you after you’ve completed the module.

When you’re completing a Learn module, you’re welcome to use your personal subscription to complete the exercises in a module. However, the sandbox is the preferred method to use because it allows you to create and test Azure resources at no cost to you.