If you know how to code, but not where, may I suggest you look into contribution to iD, the web client for editing #OpenStreetMap? Lots of people spend a ton of time using #iD to make this "open source" map better for everyone! But development of iD is going slow, and there's so much time wasted by all the editors on things that could be done better and faster, if the editor had more contributors to help fix issues.
You could look at my issues, for example :) https://github.com/openstreetmap/iD/issues/created_by/forteller