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Fixing the map https://www.openstreetmap.org/fixthemap That's not coding but looking at data issues. There's many data validation tools https://wiki.openstreetmap.org/wiki/Quality_assurance#Error_...

Specifically I'm looking at USA postcodes that contain special character, or are too short or too long. I've done that now for 10 European countries. It's 1000s of small issues, some errors are 10 years old, a huge fun variety. For each I open the online editor, a nice satellite image is presented, and fix one issue. For example finding a restaurant's website.

If you're interested in your local area http://osmose.openstreetmap.fr/en/map/ or https://www.openstreetmap.org/ click the layers button and click 'show map notes'. For global projects there's https://tasks.teachosm.org/explore