How to know your port in windows?

This is what I learn in the course I taking.

1.Open your command Prompt.
2.Type the following(this is a copy from my instructor).

D:\Documents and Settings\Administrator>cd\

D:\>cd windows\system32\drivers\etc

D:\WINDOWS\system32\drivers\etc>notepad services

**A notepad will open and will show the list of port.
**A advice also change your port number to reduce the risk of hacking.In where,I will not tell.
**Just for extra knowledge.