Perspective in Krita: Vanishing point and more https://www.youtube.com/watch?v=FobRbvuzsnI by Ramon Miranda on the Krita channel!
You can also see this video on Krita's PeerTube channel:
https://share.tube/videos/watch/acbc6e6a-f3e7-4681-bf0d-1194e4aa0a46
The PeerTube channel can be followed at @kritafoundation
@Krita