Portuguese Greetings
One exchange covers most Brazilian greetings: tudo bem, which is the question and the answer. The rest sort by time of day.
Arriving
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Oi
oy
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Hi
The everyday Brazilian hello
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Olá
oh-LAH
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Hello
Slightly more formal, and the norm in Portugal
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Bom dia
bohng JEE-ah
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Good morning
Until midday
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Boa tarde
BOH-ah TAR-jee
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Good afternoon
Midday until dark
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Boa noite
BOH-ah NOY-chee
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Good evening, good night
Both a hello after dark and a goodbye at bedtime
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Bem-vindo
bang-VEEN-doo
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Welcome
bem-vinda to a woman
Asking how someone is
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Tudo bem?
TOO-doo bang
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How's it going?
Also the answer. Tudo bem, tudo bem
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Tudo bom?
TOO-doo bohng
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All good?
Interchangeable with tudo bem
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Como você está?
KOH-moo voh-SEH es-TAH
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How are you?
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Como vai?
KOH-moo vy
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How are you doing?
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Prazer
prah-ZEHR
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Nice to meet you
Leaving
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Tchau
chow
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Bye
From the Italian ciao, and just as common
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Até logo
ah-TEH LOH-goo
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See you later
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Até amanhã
ah-TEH ah-mah-NYANG
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See you tomorrow
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Até mais
ah-TEH myss
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See you around
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A gente se vê
ah ZHEN-chee see veh
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We'll see each other
Very Brazilian and very casual
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Adeus
ah-DEH-oosh
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Goodbye
Final and heavy in Brazil. Common in Portugal
Tudo bem, and who you are talking to
Tudo bem is a question and a complete answer. Someone says tudo bem, you say tudo bem back, and the greeting is finished.
Brazil uses você for almost everyone, formal and informal alike, which makes it simpler than Spanish or French. For real formality, use o senhor to a man and a senhora to a woman.
Portugal uses tu for friends and você more sparingly, where it can sound distant rather than polite.
Adeus is worth care. In Brazil it carries a sense of finality, so tchau or até logo is what you want for an ordinary goodbye.