This is the 262nd most frequent Finnish word.
mistä
"From where" or "about what."
Here, 'mistä' is used to inquire about the origin or source of someone.
Mistä sinä olet kotoisin?
Where are you from?
In this sentence, 'mistä' is used to ask about the source or reason for knowledge.
Mistä tiedät tämän asian?
How do you know about this matter?
Here, 'mistä' is used to ask about the location or source of an item or information sought.