An easy way to contribute to OSM is by using Street Complete (https://streetcomplete.app/ https://streetcomplete.app/) which asks questions about one's surround

An easy way to contribute to OSM is by using Street Complete (https://streetcomplete.app/ https://streetcomplete.app/) which asks questions about one's surroundings. "This app finds missing map data in your vicinity and displays it on a map as quests. Solve each quest by visiting the location on-site and answering a simple question to update the map." Available from f-droid.