Hi @Andrew-InTheBox
Hello, the Microsoft ALM documentation for Power Platform will help you a lot.
https://learn.microsoft.com/es-es/power-platform/alm/
I'll tell you a couple of things that are important to keep in mind and it depends a lot on your type of project and needs.
For example, it is normal that you have a Development environment, a Test environment and a Production environment. Development is a sandbox, testing can be a sandbox and production must be production
Now, there are projects that, due to their complexity, start using 4 environments, Development, a Test environment and a Pre-production Environment and Production Environment.
Everything is the same as the previous one except that the pre-production one is a production copy with the new developments that are expected to be released so that the QA can do the tests recreating the changes with the production data, this environment is also recommended to be production
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