Share 'The Rules of Tipping'

because i work at a restaurant, i encounter people everyday who do not know how to tip. I give them the benefit of a doubt, that they just dont know how, and dont automatically assume that they are just mean. Growing up my parents always told us to tip 10%, that was in the 80's and early 90's. And from what i understand, they tipped 10% growing up to, which was in the 60's. since i have worked...