Sometimes the most difficult part of PowerShell is trying to figure out what to do with it. This is especially true for beginners where you are in a "chicken or egg" situation -- you don't know enough ...
Semantic versioning gives PowerShell script changes clear meaning so you can evolve scripts quickly without letting updates devolve into chaos.
Windows PowerShell is probably best-known for its ability to allow Windows admins to operate at scale. For instance, it would take forever to create a thousand user accounts through the GUI, but ...