Some courses involves Azure and for them you'll get an Azure pass. Tips:
Don't leave things that aren't used, they might consumed credits. If the lab instruction tell you do remove some resource at end of the lab, please do so. Delete things at end of course and you might have credits left to lab after end of course.
Activate the pass at https://www.microsoftazurepass.com. Preferably use an In-Private session in your web browser. Create a new email account solely for this purpose, this should be available when you sign in to above. You'll find a good description at microsoftazurepass.com.
The pass is valid for 30 days, or when the credits are used up, which comes first.