Dear Mayan Anastasya, thank you for your contributions to OpenStreetMap. You do not have to upload every single building - simply create 10 or 20 and then upload them all togehter. In the "changeset comment" field, enter a human-readable description of your edit (e.g. "added buildings in NAME_OF_CITY"). Do not write "ok", it makes no sense.

For the building name, only fill that field if the building has a NAME (for example "World Trade Center"). Do not but a description or the purpose of a building in the name tag. If something is already tagged as a building, don't add "Rumah" as the name - it is already clear.