Leereed
Head Pro
In simple terms as poss when is it a one shot or a two shot penalty.Someone the other day explained one club/ two club lengths rule easy.free drop one club, penalty two clubs.thanks.
Hard to think of a general rule of thumb for penalties but I tend to think of it as follows.
Deliberate/preventable act which may result in advantage is generally a 2 shot pen. e.g: brushing sand from the fringe of the green.
Accidental act or one that should not result in an advantage because the rule requires you to rectify the situation is usually a 1 shot pen. (e.g: moving a ball after address. Replace it and it a 1 shot pen, don't replace and it's a 2 shot pen)
Of course if there is any doubt check the book.