Host—No tip necessary, unless you want a better table, in which case tipping the host when you arrive could help.
Waiter—15-20% of the bill before tax
Busboy—You don’t need to tip because the server will share his or her tips with the bus staff. If they are very helpful though, you can ask the server to give them extra (which you provide, obviously).
Sommelier—20% of your wine bill before tax if he or she helps you choose wine for your dinner.
Bartender—15-20% of bar bill, or $1 per drink. If the bartender gives you a free round, give him a generous tip.
Coat check—no tip unless coat check is free, then $1
Washroom attendant—no tip unless they go above and beyond
Valet—$2 per car

Salons
You love the person who cuts your hair. In fact, you love the whole salon for making you look so dang good when you go there, so what’s the best way to show them how much you care? Krajchir and Rosten explain: