Is this a waterway/highway crossing a culvert or a bridge?

Unable to answer "Which direction leads upwards for these steps?" for osm.org/way/24596817 via StreetComplete 41.1:

Is not steps, regular way

Is `highway=service` "Oberdorfstrasse" really connecting to "Konstanzerstrasse? SWISSIMAGE suggests this is more of a footway at this part (right next to this note).

From fixme on object:
Wird diese Tankstelle noch von TopCC selber betrieben?

Was ist in diesem Gebäude drin?
Es steht auf dem Schulareal, ist aber auf der Website nicht zu finden: https://www.schulgemeinde-appenzell.ch/suchen?query=hofwies&entityType=schulhaus

Unable to answer "Does this street have a sidewalk?" for osm.org/way/30046597 via StreetComplete 42.0:

Not a residential road at all, footway/cicleway

Steps are access=private

via StreetComplete 42.0