in what way or manner; by what means

how does it work?

he did not know how he ought to behave

he showed me how to adjust the focus

used to ask about the condition or quality of something

how was your holiday?

how did they play?

used to ask about the extent or degree of something

how old are you?

how long will it take?

I wasn't sure how fast to go

the way in which; that

she told us how she had lived out of a suitcase for a week

a greeting attributed to Indigenous people of North America (used in humorous imitation and now likely to be regarded as offensive)