I have reverted this

Hi, changing Tesco Express from amenity=fuel to a shelter looks very odd to me. Is there a good reason for that?
Cheers Phil

Is your office really in the middle of a car park?

Hi, something has gone very wrong here. The A442, and Kidderminster are nowhere Llangollen. I am reverting this change.

In that case there is nothing to map, OSM is not a business directory.

Is this verifiable, i.e. if I walk down the street will I see a sign on the building and can customers visit to book an appointment?

Hi, welcome to OSM. There is no need to fill the name tag with what is a description.
We can see it is a postbox from its amenity tag.
Cheers Phil

Thank you, you should probably add that name to the object.

Hi, welcome to OSM.
Thank you for your additions, but they don't really look like they should be mapped as highway=pedestrian. That is for pedestrianised streets in town centres.
I would suggest that these should be mapped as highway=footway.
There is also no need to add oneway=no, that is assumed and the tag just clutters up the database.
Cheers Phil

Do you have any information on this artwork?

Hi, is this really a hotel? The name suggests self catering holiday cottages.

To be more accurate, it is a University not a school. It is also already mapped as an area.
I am reverting this addition.

Hi, we normally tag Tesco Express as shop=convenience, supermarket is reserved for the larger ones that are subject to Sunday opening restrictions.

I cannot see a chimney on bing, and you have placed it in the road?
What are you trying to achieve?

This seems an unlikely name for a garage in Greenford, does it have an actual name?

Hi, Berkley Mansions is already mapped as way, you have created a duplicate node in the middle of the road. I am removing this duplicate.
I also doubt it is an attraction.

Post Offices always have a name, it will either be Raphael Street Post Office or maybe Knightsbridge Post Office. There is no point just putting Post Office in the name, we can see that from the symbol. It does matter, when a card is left saying there is something to collect it will need to say which post office.
It is certainly not Royal Mail, they have been a separate organisation for several years now.
Also please capitalise names properly, all lowercase looks childish.

Sorry, having zoomed out a bit further I can see where they are. No not housenumbers.

Hi, welcome to OSM.
You should probably remove the name old toilet block is more a description than a name. Its your bike workshop that should show up first.
It is not recommended to combine Welsh/English in the name tag. In an area such as Machynlleth I tend to put Welsh in the name tag and put the English name in name:en. Welsh can be put in name:cy if you consider it more appropriate.
Cheers Phil

Hi, I assume the numbers you are adding are housenumbers.
These should not be put in the name, they should be put in the addr:housnumber tag.
Cheers Phil