@Aggelos-Minoudis hmmm - looks like, you need to learn/understand basics how route planning and navigation works. May I help you by easy words:
A route is a collection of points, defined by gps coordinates and called exactly as "rtept" (route points). A navigation app or device calculates a direction from one point to the next one, using street information in a map. And presenting it as a line as overlay on the map. Garmin is showing this line mostly in purple colour, with orange flag icons for each route point. Mostly navigation apps/devices can only handle limited amount of route points.
Very often, people are talking about this points as waypoints; but this is technically not correct.
A track is also a collection of points, defined by gps coordinates but called exactly as "trkpt" (track points). A navigation app or device is not calculating a direction from one point to the next point. But is presenting it as a line as overlay on the map. Garming let you select o colour in the settings, and only the first- and the last point will be presented in map. Usage of track points is mostly not limited.
A track is usually a recorded file during a ride.
Additionally you can enter POI (Point's of Interrest) out of a collection (gas stations, hotels, restaurants, etc.) - these are called exactly as "wpt" (way points). A navigation app or device is not calculating a direction from one point to the next point. But is presenting such points as a icon as overlay on the map.
You can save a created route in MRA-Routeplanner as gpx 1.1 fike at your computer. Then open it as simple text file (may by notepad) - then you can see it: in the file, there is the route as well as the track. And if you have entered POI - there are also included in gpx file.
If you are using MyRoute-App for navigation, you could be lucky, because this app is also able to guide/route you by a track!
If you are going to transmit a route or a track by gps file to a Garmin device, you can do this by USB, copy to SD-Card, Bluetooth or WiFi - based by device type. For a Gamin-XT, I mostly used the Garmin app "Drive" (Bluetooth). But Garmin has developed the system/app "Explore" (Wifi) resp. Thread App (Bluetooth), to be used for future - starting with Garmin XT2!
But you need to know: "Explore" is a route planning system and is calculating transmitted routes by its own algorithm. Effect: transmitted route to the device is mostly different to your original planned route!
If you switch on in your XT2 preferences, to populate both, route and track on screen. Then you will see probably a difference between track and route (because the track will never be recalculated). To prevent this, use more route points during planning. To not overspent capability of garmin device, use more "shaping points" and less "via points" in MRA-Routeplanner.