In JOSM there's a way to revert certain entities using the revert plugin:

File > Open Location. Paste in the changeset URL. Download

Select the ways/nodes that need reverting.

Data > Revert changeset > Revert Selection Only.

Leigh
I'm afraid you're a victim of the parallax error.: https://en.wikipedia.org/wiki/Parallax

The buildings of Margaret's Buildings in iD are shown 'leaning over'. For the buildings you've amended note how they were set out to ground level to their right , but you stretched their left sides to the 'overhanging' roofs.

The best way to map in this situation is to map the extent of the roof then move it so it aligns with the building at ground level.

Could you revet them please.

@azzap I haven't changed it, but you may want to have a read of the second paragraph of this: amenity=biergarten

Hi Gazzzer Welcome to OSM.
You drawn a polygon, but it requires some tags What were trying to represent? Note there's already a park mapped.

I mapped & tagged it similar to schools. Put amenity/address etc on the encompassing boundary. Any buildings should just have building=pub..

Hi Rolland
Welcome to OSM.

Is this in the correct location? Where you've placed it is a community centre.

Is there a 'no_u_turn' sign? if not I don't think it should have a turn restriction.

if it's at ground level & passes through a building use tunnel=building_passage:

tunnel=*#tunnel.3Dbuilding_passage

Hi again

I assume the bridge which got amended by your edit isn't that long?
way/263380345

Hi Welcome to OSM. Good additions ot the OSM dafabase.

The new path needs revised tags. If you know it's a PROW the best way to map it is:
designation=public_footpath
foot=designated
highway=footway
surface=*

Surface is used by many routers to decide which is the best way to go.

See also:
construction=*#Highways

Hi
If it's still being built it;s more accurate to ued this tag: landuse=construction

@ti-lo
I look forward discussing your proposal on the Tagging mailing list.

What are your plans to revert your erroneous edits?

PS
"These SHOULD be proposed on the tagging group!!! Not proposed on a wiki page."

Hi
Is the bridge open?

Although this entity was tagged indirectly in the first place (it should be shop not amenity), you made it worse by removing any primary tag & substituting with a sole sub-tag. Sub-tags are 'adjective' tags which help describe the details of the objects.

As explained previously you've change the meaning of the entity, not provided an alternative.

There is no 'issue' to solve. The entity was accurately & legitimately tagged before your amendments.
As you've no knowledge of this shop you should not have made any changes.

I'm 'complaining' because you reduced the accuracy of the OSM database.
It's disappointing you believe others should correct your errors & fill in ambiguities you've created.

I note another user has taken issue with your edits (which is even worse than this one).
I note you've been given a warning block.

Hi
if I were in your position I wouldn't have made the amendments due to lack of *any* knowledge to justify the changes. Your last sentence confirms why.

shop=motorcycle_repair means it doesn't sell bikes. You've now made it, at best, ambiguous.

Hi
"as I can't say whether it (meanwhile) possibly sells used bikes." < Again, this is the problem. You've explicitly changed it from 'definitely doesn't sell bikes' to 'definitely does sell bikes' *without* any knowledge.

I'm unsure why you don't get my point.
Was it discussed on https://lists.openstreetmap.org/pipermail/tagging/ ?

"can't do that as my crystal ball is broken" < this is the problem. You've edited a tag from being correct to incorrect without any knowledge.
According to you're wiki edits, the way you've tagged it implies it sells motorcycles. This is not good process.