Thanks @ra. And just to add: OSM has become the world's largest repository of hiking/mountain biking trails, and there are more of these paths worldwide still to be mapped. Here's my video on the subject:
https://youtu.be/LRNl5tr2KEM
In addition to making the map ever more complete, there's the singular satisfaction of using OsmAnd to navigate a path that you yourself first contributed to OSM.