By the way, you are a very neat and accurate mapper. Well done.

I changed it to a simple polygon.

fixed now, tks

Thanks, it can be a big task.

The small line is selected/highlighted here
way/1055539309#map=19/-32.07076/115.93667

Hi
Yalgan Pass Park has it’s boundary drawn with two separate lines instead of one line. The iD editor has created a relation. The relation is unnecessary for this simple park boundary which could be drawn with one continuous line.
If you join or combine the two lines the relation is unnecessary and the tags can be added to the single line making the boundary. If you can’t work out how to do that then redrawing the boundary afresh and deleting the old lines will work.

You will see the small separate line close to the junction of Cadoux Promenade and Figtree Drive

Hi
If you zoom in closer to the roundabout you will see that the two segments that join the roundabout still have the wrong name

Hi
I added office=company and shop=trade
All things added to osm need a primary tag such as these to define what it is you are adding to the database/map

Highway speeds are sometimes reduced near particular intersections and from my experience it is often due to higher use by rural transport, like cattle trucks, winery trucks, forestry logging trucks, etc that take longer to get up speed compared to the usual highway goods transport trucks.
Are you able to verify the speed limits in person?

Hi
There is still a section of this road north of the Woolmers Rd turnoff that is marked 80km. Could the limit be lower here because of the intersection.

I think the tag natural=wood may be more suitable for areas of trees than tree_row

You could tag such crossings as unmarked if you feel uncomfortable with the safety of such crossings.
highway=crossing

Hi
the treed areas bear little resemblance to the real situation with only some patches of trees being mapped.
https://postimg.cc/gallery/Hd3Xwfp

Hi
it is normal practice to continue footways across the roadways so that pedestrian routing can work. Should I revert your changes or are you able to fix?

I have retagged as above.

The water features commonly referred to as dams are tagged a little differently in the OSM.
A dam refers to the dam wall. The water area is tagged with natural=water + water=reservoir .
waterway=dam

Hi
the name is for name only.
You can use a description tag to give other information.

Hi
The site you have re-tagged as Citipointe Church still has a tag still has other tags referring to a tyre place.
The website for the tyre place has it located on Beerburrum Rd
https://www.ctyres.com.au/contact.htm
Are you able to fix these up?

Looking at the Gosford City Aeromodellers Club it seems obviously not an aerodrome so I have changed it back to a recreational ground.

Hi
welcome to OSM.

The beaches you have placed a point on have already been mapped fully as areas and named so I will delete these.

You have dragged a few points accidentally as is common when using iD. I will fix these.
https://pasteboard.co/b0X5sAAu7GRy.png

The Gosford City Aeromodellers Club should remain as a recreational ground I expect. Aeorodromes are for full sized operational airfields, not models.
Is this area serviced by full sized aircraft or only a model aircraft area?
aeroway=aerodrome

If it is a model aircraft facility, you could
check how this model airfield is mapped. Under the layers icon at the right side, select the Map Data box to see how parts are tagged.
osm.org/#map=19%2F-27.27042%2F153.03908