No worries and totally valid question! So while you won't be able to upload the full site/app/maps to your Garmin, you are able to download GPX files from Trail Run Project which you can then upload to your Garmin. The GPX file will give you the line data for any given trail or run so you can use that to navigate on your Garmin. In order to download a GPX file, just head to the trail page of the trail or run you would like to download and look for the "GPX File" link located to the right of the Overview underneath the map. Let me know if you have any other questions!