I've reverted this edit because the historical railway was wrongly replaced by highway=track. and Harefield Lane was wrongly tagged - changed it to a footpath instead.

Surely way/484413017 should be soccer?

Not sure if the possibility of connections can be turned off, though you can use the shortcut W to enable the wireframe view and make the lines smaller.
Surely the route you are plotting depends on the background imagery - either Bing or an old OS map?

If this is an active hotel then you should add tourism=hotel to the building tag :)

Did you notice if this section was signed as NCN 1? Because apparently it's an "alternate" route according to the relation role.

In the editor you are using (which is called iD) on the right hand side there is a "Map Data" option. In there is a dropdown for "Map Features" where you can deselect different types of features, allowing you to draw over them without connecting to anything else.

Can I suggest that you use the option in iD to turn off certain map features, so that you don't connect old railway lines to current landuse etc, thanks.

Hi, welcome to OSM and thanks for the edit.
These parks are fairly small - maybe they would be better tagged as playgrounds?
Also, there's some roads marked on the map as being under construction - do you know if these are now complete?

Hi and welcome to OSM. If it's a shared use path then usually it is marked as highway=cycleway to show that cyclists can use it (foot usage is assumed).

I've added them back

Hi, welcome to OSM. Just wondering what exactly is "Bike Bothy"? Is it bike parking or something?

Did you remove the highway tag from way/93334640 by mistake?

Warum hast du alle diese Gebäude dupliziert?

Shouldn't this road way/221196402 be highway=service instead? It seems to primarily serve houses

If you use JOSM with the reverter plugin you can enter the changeset ID and it will revert the changes. Or list the changesets here and I'll do it for you.

thanks for resolving the notes :)

Hi, just to let you know that with roundabouts like way/478681438, you need to add the junction=roundabout tag instead of oneway=yes

The problem with deleting these suburb nodes is currently the standard layer doesn't render areas with locality=*

Hi, welcome to OSM.
You seem to have added a single node with only a name - which is a duplication of this building: way/302020930
What were you intending to do?

How exactly do you tag an alien abduction site in OSM? :)