To get rid of Suggested Apps from your computer, click on the Search icon in the bottom left of your screen. Type Settings at the Search Windows. From the search result, click on Settings under the Best Match, Personalization, Start. Turn off the option Occasionally show suggestions in Start.
This should turn off suggested apps feature in Windows 10. Do note that all apps that previously installed or pinned by Windows will still remain on your system. Turning off suggested apps will not remove them automatically. Manual removal of these apps will be needed.
To remove, Click on the Start Windows, right-click on the tile of the app that you would like to remove and select Uninstall. It will then ask you to confirm your action. Click on Uninstall. Continue checking the list and uninstall the rest of the unwanted apps. If there is no option for Uninstall, just select Unpin from Start.