I was confused about the distinction as well until recently. The wiki really could use some better pictures of both, or maybe a diagram or something.

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Welcome to OSM! These look good to me.
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Are these kerbs all actually flush? My understanding is that flush kerbs are completely flush with the road with no lip at all.
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Hi, were these border wall edits part of a class or a mapathon or something?

Yes, you are right about it only being visible on aerial in the north part due to tree cover. However, using 3DEP layer you can pretty clearly see that the trail continues.
https://imgur.com/a/ZCg82R6

For clarity, I have no problem with the trail having restrictive access tags as the landowner requested, I'm just not sure that adding lifecycle prefix to existing trails is the right solution here.

If you look at MassGIS 2021 imagery and 3DEP there is definitely a trail there. I don't think it's a good idea to use abandoned tag in this way when the trail is definitely still present. access=no or access=private on the trail should be sufficient. Almost all trails-oriented data consumers respect this thanks to work the trails working group has done over the past few years.

Is the trail actually abandoned?

The description tag is not meant to be used as a place to advertise your business. Also, "Additional Phone numbers" is not a valid tag.
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You can press "Q" in iD to square the corners of the buildings you are mapping. The building area should represent the footprint of the building rather than just the roof shape from aerial imagery.
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Welcome to OSM! I have corrected some of the tags on your business to conform with OSM standards. Feel free to ask me any questions you may have!
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Welcome to OSM! I have corrected some of the tags on your business to conform with OSM standards. Feel free to ask me any questions you may have!
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Welcome to OSM! I have corrected some of the tags on your business to conform with OSM standards. Feel free to ask me any questions you may have!
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Welcome to OSM! I have corrected some of the tags on your business to conform with OSM standards. Feel free to ask me any questions you may have!
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Welcome to OSM! I have corrected some of the tags on your business to conform with OSM standards. Feel free to ask me any questions you may have!
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Welcome to OSM! I have corrected some of the tags on your business to conform with OSM standards. Feel free to ask me any questions you may have!
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