Places to learn Powershell?

[Makhaira]

Just wondering what the recommendations were for online places to learn powershell? I have a specific task I'm trying to achieve around iterating through all subfolders (only one level), renaming each file with a certain extension to its current name plus subfolder name, then moving the resultant file into the root directory. Up for teaching myself but there seems to be a lot of crap online so was wondering if there were any known good places to learn.

Cheers.

 

[Makhaira]

@HungryHippos I never expected someone to just give me the answer, thank you! Worked a charm!

Thanks to everyone else for your responses too.