Hi AnanasSuvyu! From how you describe "sokak" as less car-oriented, narrow, and non-asphalt, the closest English words might be "alley" or "lane"; "backstreet" or "sidestreet" might work for less-traveled roads. The nuance doesn't fully translate into English, I would probably describe them with a few words like "small pedestrian alley" or "narrow neighborhood lane"

For OSM purposes, tagging roads depends on the context and regional consensus. Based on your description, you might consider tagging them as a living street, footpath, residential road, service road or alley. The OSM wiki here can help: https://wiki.openstreetmap.org/wiki/Key:highway