I got into OSM and StreetComplete to flesh out intersections, stop signs, and sidewalks in my area. I always felt like I was doing something wrong though. I created crosswalks, then OSM would prompt me to connect the crosswalk to the road via a crossing. In StreetComplete, it felt like I was filling in duplicate data. I had to add whether the crossing had crossing lights not only at the middle crossing, but on the sides as well. This probably doesn't make any sense.
Basically, I am never confident I am editing OSM correctly. Am I supposed to manually draw out sidewalks, or tag the road as having a sidewalk? After adding sidewalks in my area, StreetComplete is now asking me if roads have sidewalks, which I clearly see on the map. Reminds me of editing the various Wiki pages. There's several ways of documenting something, only one way is correct, and it's undocumented.
When I'm unsure I make a note with a photo and someone who knows more looks into it.