Azure DevTest Labs is a cloud-based service that enables you to quickly create, manage, and secure environments for development, testing, and training purposes.

It provides a self-service portal where developers and testers can easily spin up virtual machines (VMs) with pre-configured software and settings.
Here are step by step in creating Dev Test Labs
a. In azure portal search for dev test labs and select

b. Click on +create

c. Give your resource group a name and click ok(Devrg)

d. Give your lab a name (lab1) and then choose any public environment of your choice either on or off (on)

e. Select Auto -shutdown, enable it to on, input the time you want it to shut-down(7pm), activate send notification before shut-down to No

f. Select review + create

g. Select create