For the sidewalks, you should mark the portion of the way that is crossing the street as highway=footway + footway=crossing. See the wiki for some helpful diagrams: https://wiki.openstreetmap.org/wiki/Tag:footway%3Dcrossing . iD editor will have a tagging preset for this as well, but I don't remember what it's called. Let me know if you have any questions !
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            Published using OSMCha: https://osmcha.org/changesets/146763922
            