You're welcome. Did you see my comment on the first change you did adding a business?

Welcome. Few things. For the road there are some tagging mistakes and some useless ones. Foot and bicycle tags are not needed as "yes" would be default anyway. Motor_vehicle=no would most likely be private instead as the road is used for service personnel going to antenna. The ford tags are not accurate as the stream is probably going in pipes under the road at these points. Covered tag is also pointless to add for this.

Welcome to OSM. Please do not add more tags to the address tags. These are imported from Kartverket. If you want to add a business then make a new node with the relevant tags. Thank you.

Please do not change the ref number from NSR. It will mess with the matching of the official stop database.

Hei, velkommen til OpenStreetMap.
Ikkje så lurt å endre på adressenodar sidan desse er er automatisk henta frå kartverket. Om du vil legge til ei bedrift så lag eit nytt punkt med office=it

Vers nill å ikkje slett adresser. Desse kjem rett frå matrikkelen. Om det er feil så meld frå til Kartverket.

https://seeiendom.kartverket.no/eiendom/1219/19/20/0/0

Please don't name houses like that. This is more like a description, not a name. It is also a very personalized thing and that should not be in OSM.

Be careful editing multi polygon relations with iD as it can easily break them. You deleted a segment near Fantoft church and caused a big residential area to disappear :)
I've already repaired it btw ;)

I've already reverted this now... Please ask before editing things that have recently been changed due to new tagging.
highway=toll_gantry

Please undo this. These are not toll_booths. I am updating all to toll_gantry as that is the proper tagging.

The tag might be removed as the system is complicated in some areas like Oslo with two groups (inner and outer rings) and Trondheim with 7 toll groups.

Tagging of toll points lack a lot of good documentation on wiki unfortunately. We had to basically pick something that works. Many toll projects have a one hour grace period. If you pass the same or other toll point in the same group you do not pay again.

There is a separate tag for playgrounds. Please use it.

Road class is not really set based on the quality of the road. County roads are normally secondary or primary if signed with numbers less than 1000 in new system.

I do plan to map all these dams and intakes, but there are over 3800 of them in Norway :)

Can you actually walk across on the dam?

Wrong mapping. Those are river intakes for Kvittingen hydro plant. Generator is in the power plant house/hall and already mapped.

Sorry, not headrace, but down to the penstock

This is not a pipeline. These are blasted tunnels down to the headrace.
osm.wiki/Tag%3Ausage%3Dheadrace