How to pronounce
Nǐ hǎo

Nǐ hǎo is how you say "Hello" in Chinese. Nǐ hǎo literally translates to "you good" in English, where nǐ means "you" and hǎo means "good", and it is used as a standard way of saying hello to an individual or a group of people in China.
The correct pronunciation of nǐ hǎo in Chinese can be phonetically transcribed as knee haow. When pronouncing it, the -ao in -haow must be sufficiently rounded and emphasized.