You may want to use the easier iD editor instead, especially given that you appear to have difficulty using Potlatch.

The number of the address does not belong in the addr:street field; it belongs in addr:housenumber.

Please stop deleting things unnecessarily.

Reverted, this can't plausibly be changed to the location of a single shop.

I've reverted your edits in this area, because you seem to have messed up the surrounding roads. I haven't added the shop back because it's not clear from the satellite imagery where it's actually supposed to be.

I've reverted your changeset (changeset/44621364), although I've added the shop back with proper tagging.

Hi, you seem to have accidentally deleted a hospital and done various other weird things, please don't do that. Also, you shouldn't be labelling shops with highway tags; and you may want to use shop=furniture instead of shop=showroom because the latter isn't a documented value.

Hi, from the Bing satellite imagery this doesn't appear to actually exist so I've removed it for now.

Sorry for accidentally undoing this as well. In future, it would help to add the English name, as well as update the landuse around the building (way/449693730).

No test editing please.

I might be wrong, but aren't there separate speed limits depending on travel direction for some parts of the line?

Line colours are added to the route relations, not the tracks. (The MTRC doesn't paint the physical tracks bright red.)

So I guess the consensus is to tag only the stops as railway=tram_stop and not have railway=halt/station? It seems sensible, if not for the fact that the system is fully bidirectional.

railway=tram_stop is probably a bad idea for the stop positions, causes rendering mess. Maybe better just to use railway=stop

Is this section of the road bus/taxi only?

route=railway might be better for this because it doesn't map an operating service but a railway (group of tracks related to each other).

I'm not sure where you got the data from, but Chinese Wikipedia says the runway is actually 1905 metres long and 37 metres wide.

The road classifications were fine before and you should change them consistently if you really think that they're wrong for some reason. It's not particularly helpful to add "horse=no" on a highway, because that's assumed normally.

Also, the curve in Castle Peak Road does not exist there (Bing/Mapbox satellite imagery).

– Variable speed limits are tagged according to maxspeed=*. Hyphen, unfortunately, isn't allowed because it's not very useful when read by an app
– These roads had the right classification before
– The surface tag isn't really meant for beaches; it's usually for roads.