I need to get back into OSM. Pokemon Go was the reason I initially started contributing. The game uses (used?) OSM map data, and certain Pokemons will spawn near certain biomes (water, woods, etc).

My little cousin played the hell out of PG around 2017-2018, and they mostly played it around the big park in our town. At the time, the park appeared on OSM (and by extension PG) as a featureless green polygon with a few roads and footpaths. In reality it has a bunch of woods, streams, a pond, playground, public pool etc. So I did a quick readup on how to add stuff to OSM and I gave the park a digital makeover. I even walked around the footpaths with my phone and marked them out with the GPS so that they would appear in the map more accurately.

Unfortunately it was quite a while before Pokemon Go updated its OSM database, and my cousin lost interest in the game by then. But I kept at contributing for quite a few years, adding random stuff in spurts and stopping for a month or two