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:

Shampoo girl—$2-5
Manicurist—15%
Hair stylist—15% or more if he or she did a complicated cut or an amazing color job
Massage therapist—15%
Facialist—15%
Spa Attendants—At a resort spa, tip about 5% of your bill at the front desk. If anyone went above and beyond, tip them in person. At day spas, you don’t need to tip the attendants. However, if you go to it regularly and the attendants go the extra mile for you, you may want to tip.

Vacation
When you’re on vacation, the last thing you want to worry about is forgetting to tip someone. Here’s who you should remember, according to Krajchir and Rosten:

Doorman—$1-3 per service
Cabdrivers—10% of fare, unless he or she goes above and beyond
Bellhop—$1-2 per bag
Concierge—$3-5 for making dinner reservations, more for other services like booking tours, etc. If you just ask for directions, you don’t need to tip.
Maid—$2 per night
Room service—15% of bill

Foreign countries
Going to a country where you barely speak the language is stressful enough without worrying about the different gratuity customs. Here’s a shorthand guide so you don’t offend from www.bbc.co.uk. When traveling to: