Just uploaded my first set of edits to OSM!
Took some GPS tracks last week (need to anonymise before uploading, which I've not figured out yet) around my area, and updated maps based on this. So far I've added pedestrian paths & steps, and part of the local station commuter car park.
Hope these edits are suitable, and I look forward to making more contributions to OSM! There's plenty around me that needs doing.