So you need some help on a Powershell cmdlet? Well of course there is built in help e.g.
If you need more...
Well the first thing to do is make sure you have all the latest helpfiles, you can update them on line using the cmdlet:
Then, remember that there various bundles of help associated with most cmdlets. Here are a few used against the example cmdlet get-childitem:
get-help get-childitem -detailed
get-help get-childitem -examples
get-help get-childitem -full
get-help get-childitem -verbose
and the much overlooked...
get-help get-childitem -online
Which will save you from a Google searcch