If you'd like to contribute to #OpenStreetMap but feel lost and unsure where to begin, I can recommend getting StreetComplete, which turns filling out OSM data fields into a game of completing quests in your local area. You'll get questions like "What's the road surface here?" or "What are the opening times for this shop?" or "What's the house number of this house?" and can just go there and check and then answer. Very convenient for me who don't understand GIS and OSM!