Thank you for the information freebeer :)

I've removed my multipolygon, it didn't work.

Also check here please: changeset/62403282#map=18/54.19286/28.47579&layers=N

I've added a multipolygon, because the field was not visible because of stadium tag overlapping. Can anyine please confirm if the multipolygon was added the right way? Here is the link: changeset/62403138#map=18/54.19286/28.47579&layers=N

This is how the Toyota Stadium looks now with the new stands. By the way, I'm done with the stadium edits now. I've already reverted a lot of errors of my older edits, I'm going to check more of my older edits for errors.

Hi freebeer, I didn't ignore your reply at note/1516258. I just didn't fully understand it, I was afraid to do it the wrong way. That's why I made a construction site of it and asked you it that was also okay. I saw such construction sites at other stadium places, that's why I made it that way. I thought it might also be a decent solution, because I didn't fully understand how I could do it the way you explained it. I didn't understand every detail. Don't get me wrong, I appreciate your help very much, but I didn't fully understand it. English is not my first language, I understand basic English.

You said that my edit at Toyota Stadium was wrong, with grass included in the stands. But new stands were built at this stadium as you can see here: https://lifestylefrisco.com/wp-content/uploads/2017/12/Toyota-Stadium.jpg

Thank you for that, that's fine.

Thank you for the information freebeer.

It is the official writing style of the stadium. Here you can see it for example, at the official site of tenants Sparta: https://sparta.cz/cs/klub/generali-arena/

A sports field tag and a stadium tag should overlap, a sports field tag and a building tag shouldn't overlap, that's how it works right?

I can add the two missing stands with a building tag I guess?

That's okay, you're right about this.

I don't really get the concept of a multipolygon. I've read something about out, but I didn't fully understand (sorry, English is not my first language).

Thanks for the hint, yes you're right about this. I've changed the name into "Balıkesir".

Yes, that is the thing I can't figure out how I can fix it, those inner rings. How can I "cut out" a part of the building for example, so that the football pitch and the building don't overlap? Here I have the same problem for example: changeset/62353609 If I know how I can fix this, I'm going to fix it ofcourse :) I've tried to find it on Wiki OSM, but I couldn't figure it out.

Thanks again! I've fixed this error.

Thank you very much for the information SomeoneElse. By the way, I've found a stadium which is added, but doesn't show up. Other buildings in the area also don't show up. Do you know what is wrong with it? This is the one: osm.org/#map=18/40.67839/122.11570&layers=N

Can anyone please check if my edit is without errors this way:

changeset/62325475#map=18/39.64155/27.88770&layers=N

The stadium name is now correct. Can anyone please tell me if I've added both stadium roofs and the sports field the right way this way? If it contains an error, please let me know and I will fix it.

Hi, "Tribune Colombier" of Stade Raymond-Kopa now has the same size as "Tribune Coubertin". Is now has a square shape. The old stand has been replaced with a new one. Who can fix this? I'd really appreciate that. Thanks for the help already.
osm.org/#map=19/47.46040/-0.53094&layers=N

I'm going to change this, I'll add the name at :en. (This is an old edit of me, I've already heard that the names could better be in the :en section).