to get the best location data on your photos, i think one process that should work in all cases is to bring up your map app first and use that to find your location. once you see that your map app has a good lock, switch back to your camera app or other app to take a photo. there are other things you can do to get good results, but if i have 30 seconds to explain this to someone with unknown technical aptitude, this is what i will tell them to do.
here’s an article about the (in)accuracy of locations supplied by smartphones: https://geoawesomeness.com/how-accurate-is-your-smartphones-gps-in-an-urban-jungle/.