Adding a Web Part to a farm - Add-SPSolution

Hi,

Here is how to add a wsp file to a SharePoint Farm:
Open SharePoint PowerShell in Admin Mode

Command:

Add-SPSolution -LiteralPath <Path and File Name>

Now open Central Admin

Goto System Settings and then click on Manage Farm Solutions

Click on the solution you added and then on Deploy Solution.
Then you change the settings to what you want and click ok

Your Solution is now deployed

Now you need to go to your site settings and enable the future you added under "Site Collection Features"