Hi, Welcome to OpenStreetMap.
I've separated/unjoined the path from field boundaries and other features. Then joined it to the track at the western end.

Regards Bernard.

No response so I've removed those three items.

Hi, Welcome to OpenStreetMap.
I slightly amended your address and added a website.
I take it there are several units in that building, it would be good to better direct folk if you could amend it to individual units. Then you could put your details on the correct unit.

Regards Bernard.

Hi, Welcome to OpenStreetMap.

I've made a few amendments to the buildings you mapped. I can see that you adapted you tagging as you progressed but it still lacked from OSM practice. Buildings comprised of multiple houses are best tagged as building=residential, a single or semi house is building=house. Buildings are not tagged landuse=?

I've amended the tagging and more accurately re-drawn some of your long buildings which are actually comprised of several buildings.

I hope this will help with future contributions to OSM.
Regards Bernard.

Hi, I've removed the duplicated island, retagged it as an islet, reinstated the wood tag. Then amended the multipolygon tagging, (the tags go on the relation not the feature).
Regards Bernard.

Hi, It's difficult with the iD editor to revert changes so I've reverted that changeset with the JOSM editor.
Regards Bernard.

Hi,
The trees do show in Mapbox imagery, Esri beta imagery at some zoom levels and on a well known online service. So I think that ought to be cause for an on the ground survey before deletion.

Hi, Welcome to OpenStreetMap.
There have been many amendments made to most of your changesets. Could you please take a bit of time to consider OSM established practices and adjust your next mapping to suit this.

Regards Bernard.

Removed duplicated buildings and private access tags.

Hi,
Welcome to OpenStreetMap.
I've made several corrections to tagging of buildings, parking, slipways and removed incorrect tagging. This to suit OSM practice.

Regards Bernard.

Hi, welcome to OpenStreetMap.
I've changed the area back to recreation ground because it is used for informal recreation, the land is not used to grow grass. In order to show the landcover/surface I've added surface=grass, this states the material that covers the area surface.

Regards Bernard.

Way: 771084003 is a duplication so I've removed it and tagged the existing track as bicycle=yes.

Hi, Regarding your new cycleway Way: 771088465. You placed it on top of a way already tagged as a bicycle=yes thus making a duplication of the cycleway. I've removed the duplication.

Regards Bernard.

Hi,
I searched the web and found out "Ruislip Woods now consists of Bayhurst Wood, Copse Wood, Mad Bess Wood, Park Wood, Poor's Field/Ruislip Common, the Ruislip Local Nature Reserve, The Northern Finger, Grub Ground, Tarleton's Lake and surrounding land in Hillingdon. Ruislip Woods National Nature Reserve, at 305 hectares or 755 acres, is the biggest single area of woodland in Greater London."

So the notice board must be about the greater area of woods, not limited to the section that it's in. It might be a good idea to make a relation of the greater area of Ruislip Woods.
I've added a description and website to your POI.

Regards Bernard.

Hi, welcome to OpenStreetMap.

The woods are near Ruislip but isn't the name Bayhurst Wood as tagged on the woods perimeter line. Could you check and amend if necessary?

Regards Bernard.

Hi, I've removed the sections of highway paths that duplicated highways are existing. Please section up and tag the existing highways if needed. Placing a highway path on top of a other highways is incorrect mapping.

Need any help please just ask, Regards Bernard.

Hi, Welcome to OpenStreetMap.

Your street, path and two buildings have some faults. In fact they look like fiction. If this is so could you please revert this changeset. If you need help adding genuine features please just ask.

Regards Bernard.

Hi, Welcome to OpenStreetMap.
Sorry to say that you somehow duplicated a lot of the buildings. I've removed all the duplicates though.

Regards Bernard.

Hello and welcome to OpenStreetMap.
I can't see that building on any imagery. If it is a fictional test could you please remove it?

Regards Bernard.

Hello and Welcome to OpenStreetMap.
I'm sorry to have to say that you've made mistakes on nearly everything you've added. Duplication, oneway on no through road, joined roads to buildings, placed fiction hydrants to road centre line, joined power poles to roads, joined POI to roads, drawn buildings on field areas.

There looks to be very little that is presented correctly, therefore I think it best to revert the changes. I've reverted with Changeset: 81716935 so the database is back as it was.

Please take time to learn the practices of OSM, (there's lots of help online), and if I can help with anything specific please just ask.

Regards Bernard.