How To Install RSAT Tools
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Click the Start icon to open the Start menu
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Click the Settings icon to open the Settings menu
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Click on Apps
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Click Optional features
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Click Add a feature
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Scroll down the list of optional features until you find the RSAT features. Select whichever RSAT features you want to add, then click Install
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After clicking Install, you will see the status of each RSAT feature being installed
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Once the tools have finished installing, you'll be able to access them through the Start menu in the Windows Administrative Tools folder
How To Install RSAT Using PowerShell
List All RSAT Features And The Installed State
Get-WindowsCapability -Name RSAT*-Online |Select-Object-Property DisplayName, State

As you can see from this screenshot, this machine already has a few RSAT features installed.
Installing RSAT Feature By Name
Add-WindowsCapability -Online -Name "Tool.Name"
ReplaceTool.Namewith the name of the RSAT feature you want to install.
Here is a list of all of the RSAT Tools with their proper PowerShell names.
For example, if you wanted to install Remote Desktop Service Tools, you would run this command:
Add-WindowsCapability -Online -Name "Rsat.RemoteDesktop.Services.Tools~~~~0.0.1.0"