PowerShell comes with lots of white papers. However, you do not need to know the exact title of the white paper to find information about a specific topic. Simply use Get-Help and enter a keyword that is contained in the white paper title.
You should try this if you'd like to find out more about special characters:
Help special
You should use this to get more information about comparison operators:
Help compari
However, if your keyword is not specific enough, the command will list the names of all white papers. Instead, you should pick one from the list and specify its exact title.