One of my best friends worked his way through college as a busboy and waiter. He taught me how and when to tip...and if possible use cash.
>> if possible use cash <<
Very bad advice in today’s world, because it seems nowadays that when you pay the tab by credit card and pay the tip with cash, the waiter/waitress is likely to scribble some kind of ethnic slur on the tip line of the credit card slip and then use that “evidence” to sue you for a hate crime!