>>997120Not every line has to point to a vanishing point in a picture though, if lines are perfectly parallel to one another they don't have one.
In this picrel, the vertical lines point to a vanishing point, but the horizontal lines don't, so there is no vanishing point for those. Since there's only one vanishing point here, that's one point perspective.
If you try to find the perspective of a picture but the lines look all curvy instead of pointing to a vanishing point straight, you might be dealing with a fisheye lens; it's probably better to start with pictures where vanishing points are easier to find.