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Yes it is a something that takes a while to get used to but once you have it gives you absolute control of gpx tracks, including joining them extending, adding and removing points, moving individual points etc etc.
Creating gpx files containing multiple tracks and routes and waypoints AKA points of interest.Can create either gpx track files or gpx route files, some devices can use both and treat them in different ways, garmin edge series convert to fit files whereas some devices can and do use the raw gpx route or gpx track files.
As always depends on your requirements.
Do Garmin people use basecamp? I normally make a gpx in komoot or ride with gps or whatever and just drag and drop it into the garmin as a dumb storage device. Is there any advantage to basecamp?