Forgot about the big one for us without uncapped data :
Turn off Windows Update Delivery Optimization (WUDO)
Go to settings
In the Settings Window, you need to click on the "Update & security" option.
Now in the Update & security Window shown below with "Windows Update" highlighted on the left side, click "Advanced options" on the right side.
Then in the Advanced options window, click on "Choose how updates are delivered".
Option 1 above is the setting that you need to click to turn off WUDO altogether. If you decide to do this, the other two options will be grayed out. However, if you wish to leave WUDO on, there is some granular control.
You can't turn on option 2 and 3 at the same time. It's one or the other. If you choose option 2, it will allow you to share the update with other machines only on the local network so it won't use any internet bandwidth. This option would in fact reduce your internet bandwidth usage if you own more than one Windows 10 device because you would only need to download the update once over the internet.
By default, Windows 10 comes with option 3 turned on. This shares updates not only with Windows 10 devices on your network but also over the internet. When sharing over the internet, you will help to speed up other people's updates and they will help to speed up yours. It should be noted that any sharing will occur in the background and will use minimal bandwidth. Keep in mind that if you have a metered or capped connection it could cost you depending on your plan so you should set option 1 to off or turn on option 2.