The Android app StreetComplete is an excellent start for updating OSM I found. There soon become occasions when you have to bring out the big guns and edit it u

The Android app StreetComplete is an excellent start for updating OSM I found. There soon become occasions when you have to bring out the big guns and edit it using the web editor at https://www.openstreetmap.org/ https://www.openstreetmap.org/ , which is possible to do on a mobile phone if it has a big enough screen, but much easier on a laptop.