Environment strategy for ALM
To follow application lifecycle management (ALM) principles, you'll need separate environments for app development and production. Although you can perform basic ALM with only separate development and production environments, we recommend that you also maintain at least one test environment that's separate from your development and production environments. When you have a separate test environment, you can perform end-to-end validation that includes solution deployment and application testing. Some organizations might also need additional environments for user acceptance testing (UAT), systems integration testing (SIT), and training.
Separate development environments can be helpful to help isolate changes from one work effort being checked in before it's completed. Separate development environments can also be helpful to reduce situations when one person negatively affects another while making changes.
Every organization is unique, so carefully consider what your organization's environment needs are.
You should answer questions such as:
How many development environments do I need?
How can I automatically provision environments from source code?
What are the dependencies on my environments?
You should also answer the question, "Which types of non-development environments do I need?"
For example, in addition to your production environment, you might need separate test, UAT, SIT, and pre-production environments. Notice that, at a minimum, any healthy ALM practice should include using a test environment prior to deploying anything to the production environment. This ensures that you have a place to test your app, but also ensures that the deployment itself can be tested.
More information: Establishing an environment strategy for Microsoft Power Platform