These labs are designed for courses where Azure resources are provided to students by the institution. To try them out, or to use them outside the classroom, you can use one of our free subscriptions.
If you are a student aged 18 and up and have an email address from an academic institution, you can sign up for the free Azure for Students offer at azure.microsoft.com/free/students without a credit card. At the time of writing this gives you $100 of credit to use over 12 months, as well as free tiers of a number of services for that 12 months. At the end of the 12 months, if you are still a student you can renew and get another $100 in credit and 12 months of free services.
You can also sign up for the GitHub Student Developer Pack for a wide range of student software and services, and for there sign up for an Azure for Students account.
If you are not a student, you can sign up at azure.microsoft.com/free. You'll need a credit card for verification purposes only, you'll not be billed unless you decide to upgrade your account to a paid offering. At the time of writing the free account will give you US$200 of free credit to spend on what you like in the first 30 days, 12 months of free services, plus a load of services that have tiers that are always free.