There are 316 ethnic groups which speak 670 dialects in Indonesia.

Bahasa

• Bahasa means Language
• Indonesia is the name of the language.
• Bahasa Indonesia means : Indonesian Language as Indonesian National Language

Travel Languages

Magic words

• Terima Kasih, means; Thank You
• Ma'af, means; Excuse me, sorry
• Tolong, means; Please

Show me the Money!

• Ratus, means; hundreds
• Ribu, means; thousands
• Mahal, means; Expensive use "Terlalu mahal" to say "Too Expensive"

Hi

Indonesian (do) commonly say's: "Hi" or "Hello" thou the Bahasa for it, is "Salam"
Greets will always start will word of Selamat

• Selamat Pagi, means; Good Morning, Pagi means; Morning
• Selamat Siang, means; Good Afternoon, Siang means; Afternoon
  
• Selamat Malam, means; Good Evening, Malam means; Evening
  

Footnote

Wiki_Translation_Teams

• Couchsurfing Indonesia, in CS wiki, you can check here Indonesia