Hello samuelrussel. I've seen that you correct the misspelling. But did you read the wiki mentioned above? There you can read:
"For tagging amphitheatres, open-air or outdoor theatres, the Talk page suggests using theatre:type=amphi."
Is there a gap so you don't use it?

Sorry, i was to fast: `alt_name`, underscore instead of colon...

Hello Virgil Guo. At relation/7551133 there's an unnecessary colon after `alt_name`, right? #newkey #typo

Hello BCNorwich. At way/506527041 you have tagged `akt:name=...`, which is unkown. I think it should be `alt:name=...`, right? Please have a look at osm.wiki/Names
#newkey #typo

Hello buna. At way/286592916 you have tagged `adrdr:street=..`. I think it should be `addr:street`, right? #newkey #typo

Hello Natalia18. Does this building really has two addresses? Or is one the new and one the old one? Or has it two different entrances? Then you can map the entrance and tag the addr to these entrances ;-)
PS: The problem is, that nobody or any navigationapp would search for addr2...
#newkey

Hello RoadWarrier. At node/5105462048 you have tagged `addr"state=...`. I think it should be `addr:state`, right? #newkey #typo

Hello Глеб. At way/524664891 you have tagged `.=service` along to `highway=service`. I think the first one is unnecessary? #newkey

Der Dorfplatz ist ja ein `highway=pedestrian` und somit im weitläufigen Sinne eine "Straße" und an eine Straße sollte kein addr:postcode, sondern eben postal_code stehen (laut dem Wikiartikel)

und deshalb wird dir vielleicht jetzt auch die durchaus - meiner Meinung nach - berechtigte Fehlermeldung von JOSM klar: "verdächtige Merkmalskombination - highway zusammen mit addr:postcode, dafür postal_code benutzen"

Wenn du dir die Historie (way/41808363/history) anguckst, dann wurde mit Version #3 addr:postcode hinzugefügt, dann mit Version #5 addr komplett entfernt, dann mit Version #10 wieder hinzugefügt, und du hast dann vor zwei Tagen mit Version #11 `addr:postal_code` daraus gemacht, und das ist das Problem, da es nur `postal_code` gibt und nicht `addr:postal_code` (sondern eben `addr:postcode`), und ich habe letztendlich erstmal nur das falsche `addr:postal_code` "angemeckert". Ob jetzt in der Tat `addr:postcode` oder `postal_code` richtig ist, ist jetzt die Frage. Ich hätte aus dem Wikiartikel eher `postal_code` rausgelesen.

right, but there's a typo in your key `abondaned`, you have reversed the o and a ;-)

Hi Luckymag. At way/402873727 you have tagged `trucktype` instead of `tracktype`. But `highway=unclassified` hasn't any `tracktype`, only `highway=track` should has some.

Hello RIVERLIM. At node/5102861050 there's a leading comma: `,natural` ;-) #newkey #typo

Hello RIVERLIM. At node/5102861050 there's a leading comma: `,natural` ;-) #newkey #typo

Hello r2d. At way/144094238 it should be `vehicle` instead of `vehicule`, right? #newkey #typo

Hello samuelrussell. At node/1614492632 you have tagged `ups=yes`. What is it for? #newkey

Hello afonin. At way/130590260 you have tagged `Trans-Siberian=Railway`. I think this is unnecessary, right? #newkey

Hello rowers2. In this changeset you have tagged several ways (i think copy'n'paste) with misspelled `tractype` ;-) #newkey #typo

Hello padvinder. At way/524511096 you have tagged `TRACKTYPE`. I think it should better be lowercase, right? ;-) #newkey #typo