Awesome! This is great to see; most mappers never go back to fix their mistakes.
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Published using OSMCha: https://osmcha.org/changesets/152919950

No source. Tip: If an ATM is embeded into the wall of a building, then you could add a node to the building along with the ATM's tags. Just make sure to square or straighten the building after you've added the node.
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Published using OSMCha: https://osmcha.org/changesets/152918174

You can make circles in the editor by placing 3 area or way nodes on its circumfrance, then pressing o if I'm correct. Then you can select and delete the nodes you don't need, by shift, click and drag then pressing the delete key. This should leave you with a smooth curve for a feature like this. To finnish off add the straight lines and hopefuly if you press q to make them square,that wont mess everything up.
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Published using OSMCha: https://osmcha.org/changesets/152918142

When you modified this building, you took a parking lot with it. This is because they share (grey) common nodes. You can dissconnect common nodes if you click on them, and the right click, dissconnect, or use the appropriate shortcut. You can find shortcuts, and other useful info if you press h for help in ID editor.
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Published using OSMCha: https://osmcha.org/changesets/152918101

This looks like 2 buildings in the imagery **not** 1. If things look different compared to imagery please state this in your change-set comment to reduce the likelihood of other mappers changing the features you mapped.

If it is in fact 2 buildings, then map it as 2 buildings and add a POI in the meantime (explain your intent/rationale in your comment for more complex situations). There are other ways to link features in OSM.
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Published using OSMCha: https://osmcha.org/changesets/152917846

It states the house number is 4402.

I'll stop mentioning using q to square :) I'm sure you'll use it from now on. It's a common beginer mistake.

Thanks for the reply!
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Published using OSMCha: https://osmcha.org/changesets/152917496

Press q when the building footprint is selected (pulsating outilne)
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Published using OSMCha: https://osmcha.org/changesets/152917573

Thanks for the comment and source.
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Published using OSMCha: https://osmcha.org/changesets/152917537

Press q to square the corners of regular features like this too. It works on all geometries, **not** just buildings.

Does this parking lot really have a house number and postcode?
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Published using OSMCha: https://osmcha.org/changesets/152917496

If your source is GPS you could anonymise and upload the trace for other mappers to be able to verify. There is a redundant node on the southern wall causing the building to look wonky. I uploaded a [change-set](changeset/152920018) where I edited the geometry of this building as a demonstration, based on the aerial imagery.
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Published using OSMCha: https://osmcha.org/changesets/152917463

Thanks for the comment and source. This building footprint is inaccurate and its corners have not been squared. If the geometry is different in reality than in imagery please state so in your change-set comment.
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Published using OSMCha: https://osmcha.org/changesets/152917430

Thanks for the comment and source. This building has square corners, Well done.
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Published using OSMCha: https://osmcha.org/changesets/152917389

Thanks for providing a source and comment. Press q to square corners.
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Published using OSMCha: https://osmcha.org/changesets/152917347

No source. Press q to square corners.
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Published using OSMCha: https://osmcha.org/changesets/152917316

Thank you for providing a change-set comment and a source. please press q to square corners, this shouldn't move the nodes associated with the 45 degree wall as it is significantly off-square. Idealy write full sentences in your change-set comments.
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Published using OSMCha: https://osmcha.org/changesets/152917241

No source. Assuming that the imagery is well geo-referenced. This building's footprint should be moved to the NW, because even though the building is casting a shadow on itself, it is possible to see both its North and West sides from this imagery. You are mapping the building's footprint i.e. where its walls touch the ground. Although the roof can help you to get the right shape you are not mapping the roof per se.

The parts to the SE of the roof should be added before the entire footprint is moved to the NW. You added an unnecessary node to the SE of this footprint, and in this case it appears that it will result in that wall not being straight when rendered on the map. Please press q to automatically square the corners of buildings as it more practical and accurate than drawing 90 degree corners by eye.
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Published using OSMCha: https://osmcha.org/changesets/152917172

No source. The park and sidewalk in the SW share a common node that I think you added accidentally. Generally highways and boundaries/areas like this should not share common nodes. Hold ctrl when adding nodes in ID if you want to avoid them snapping to other features.
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Published using OSMCha: https://osmcha.org/changesets/152916339

No source.
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Published using OSMCha: https://osmcha.org/changesets/152916266

You did not provide a source for this change-set.
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Published using OSMCha: https://osmcha.org/changesets/152916228

It's good that you modified this POI, instead of deleting it and adding a new one in its place. This way the history of that node/POI is easier to follow.
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Published using OSMCha: https://osmcha.org/changesets/152916212