Hi budinurdin,
thanks for the question, there are quite a few.

The baseline is:
You can do practically everything in powershell that you can already do in the command prompt, but better. In addition to being a shell powershell is also an object oriented scripting language, which makes output processing a lot easier and non localized. There are a lot more prebuilt commands and most Microsoft Products (and some other) have their own modules for administration.

Also, as you will see in the upcoming parts, powershell is a very elegant language which allows you to do fairly complex task with even a single line of code.

And a few dozen other things like builtin remoting, easy access to WMI, CIM, COM, multithreading etc.
It is too much for one post and a lot of things are out of scope for the beginners series but i hope that gives you an impression.

Regards