This command means that the dog should stand.
I start with the dog in a sit position, then with the treat in my hand pass the nose and forward.
That will get the dog to stretch their neck and then lift it’s butt from the floor/ground.
If needed you might need to gentle stop the dog from walking forward with placing your hand infront of their chest.
When they learn this move on to stand still and not moving forward or sitting down.
If you hold a treath infront of the dogs nose many dogs tend to sit down (because that is simular to how you might have tought the dog to sit) So if you have a treat in your hand hold it away from the dogs nose and in hight witht the nose so the focus is forward.
Add the word , Stand, Stå, Stop, Stilla.