Hi,
Welcome to OSM.
The relation/13250661 for trees in not correct. Multiplygon outer ways cannot have shared segments. See https://tools.geofabrik.de/osmi/?view=areas&lon=151.24230&lat=-33.84503&zoom=17

In this case the tree area extends well beyond what you have mapped. Don't be afraid ove overlapping things - such as trees over paths.

I have removed this relation so it will disappear from the above websit. I have replaced it with a simple way see way/986145111

Reverted.

New Way: Western Sydney International (Nancy Bird Walton) Airport (985743235) ... shares no nodes with anything else. That is sourced from Maxar Imagery. I anticipate that the true airport area may be larger.

Please make your changeset comments usefull

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Read osm.wiki/Good_changeset_comments

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This has substantially moved the suburban boundary for Badgerys Creek and Luddenham.

What is your source for doing that?

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I can see that the airport uses nodes from various other things .. and this may be why the changes were made .. I think a reversion is in order and the way for the airport changed to a relation so that where it uses other things it is apparent to anyone who wants to modify it that they are not oly changing the airport but also the other thing.

Hi,
The changeset comment gives no indication of what is being done nor why it is justified. Suggest you read osm.wiki/Good_changeset_comments

In this instance the change is only bicycle=designated to bicycle=yes. As this is highway=cycleway I would think designated would be the best access tag.. see
access=designated

The changeset has been reverted.

Ok .. I'll ad alt_name or some such tag.

Hi,
On the DCS Base Map Bellambi Lagoon is called Bellambi Lake... which is it .. or is it both?

Hi,
Welcome to OSM.
Would not 'Helena' and 'Niona' be names of the buildings?

Hi
If you tag a way with natural=water then renders will show water over the entire area. Even if you add a relation that says there is a hole in there..
Hint... where there is a multipolygon relation .. the outer ways should not have the tame tags as the relation.

The relation/13209360 is not being rendered as it only has an inner .. there needs to be an outer...

A problem is that the inner touches the outer in the building relation.

As the road is in a 'tunnel' then there is no need to put a inner in the building. This actually works against the building as it does not have a vertical hole in it .. and that is what an inner would be a vertical hole .. not a horizontal one.

See https://tools.geofabrik.de/osmi/?view=areas&lon=144.95765&lat=-37.82244&zoom=16

Note that OSM only has 5 layers, for a 100 story building these layers have to cover lots of floors.

No,

See https://tools.geofabrik.de/osmi/?view=areas&lon=145.21591&lat=-37.73640&zoom=15

correction building=farm ... OSM equivalent now to homestead.

One building=barn to building=far (homestead) and added name ...
Source - DCS Base Map + Imagery

You have overlapping tree areas! And the relations for them ... one is broken.
Relations
Relation: 13196716 - ok
Relation: 13196716 - broken
Relation: 11798320 - ok

Hi,
This removed some boundaries from the Kosi NP. Note: the tree areas should be removed from the park boundaries... unless they really are aligned. Do not move the tree boundary when it is also used for other things.. make a new way for the tree edge and divorce it from the other things.

Bridge street has been split in order to use it for an admin boundary... I think it was used this way before this changeset.

Ok,
I'll have a look at it later and see if I can make some form of sense out of it.

Albert - start small. Use a good source and state the source under 'imagery used' ... yes you can include more than one source.
See osm.wiki/Good_changeset_comments

Hope that helps.

Can you be more specific about ht esource? Note that sources that are OK to use are listed here osm.wiki/Australian_data_catalogue#Victoria