When you are studying for Azure Cloud exams and working off the Microsoft Learn website, then realize your personal Azure account is GROWING
The reality is that the bulk of these costs is covered, given that the Learn site utilizes sandboxes for on-hands learning. But there were a few situations where using a regular Azure account was required. Also, for the purposes of learning and certification exam preparation, these resources can simply be deleted.
Of course, it is always best to monitor costs. The Azure Management section provides for helpful cost analysis, budget monitoring and optimization tools.