Hello!

I'm having issues with getting past this trail head. I'm currently in Windows Powershell but can't get past extracting the package source to the project - specicially unzipping the file ( unzip unpackaged.zip -d . )

I get this error :
 unzip : The term 'unzip' is not recognized as the name of a cmdlet, function, script file,
or operable program. Check the spelling of the name, or if a path was included, verify that
the path is correct and try again.
At line:1 char:1
+ unzip unpackaged.zip -d .
+ ~~~~~
    + CategoryInfo          : ObjectNotFound: (unzip:String) [], CommandNotFoundException
    + FullyQualifiedErrorId : CommandNotFoundException

I'm working on the "Quick Start: Salesforce DX" trailhead project, and in the section "Set Up the Project on Your Local Machine", I am getting the following error when trying to clone the app repo (step #2). 

I enter this into command prompt:
"C:\Users\Adam\my_sfdx_project>git clone https://github.com/forcedotcom/sfdx-dreamhouse.git"

This is what is returned:
'git' is not recognized as an internal or external command,
operable program or batch file.

I'm pretty new to command line and github, so not sure what to do. I do have Github installed on my machine.
Does anyone know how to resolve this?

Thanks in advance,
Adam