Tact is a GameObject, and you’re assigning the Transform of the GameObject tagged "Tact". A Transform cannot be converted into a GameObject, even if typecasted.
What you should do is delete the .transform at the end of that line. That should fix the error.
Ok, but if I want to go up in Y by 3 if it's a transform, how do I do that?
Transform - is the component of Game object(it added by default).
Your error - DefSpawn is Vector3, it does not contain transform, this is simple 3d vector.
Player.transform.position = DefSpawn;
Ok, but if I want to go up in Y by 3 if it's a transform, how do I do that?
– TheRichardGamer