How do you convert between addresses and coordinates (geocoding)?

Use Geocoding.Default.GetLocationsAsync to turn an address into coordinates and GetPlacemarksAsync for reverse geocoding (coordinates to address). Results are platform-provided and may return multiple candidates; handle empties and pick the best match.

var locations = await Geocoding.Default.GetLocationsAsync(
    "1600 Amphitheatre Pkwy, Mountain View");
var first = locations.FirstOrDefault();