warum?/wieso?/weshalb?

asking for a reason:

why?

was?

asking for a thing:

what?

wer?

asking for a person (nominative):

who?

wessen?

asking for a person (genitive):

whose?

wem?

asking for a person (dative):

who(m)?

wen?

asking a person (accusative):

who(m)?

wie?

asking for a manner:

How?

wo?

asking for a location:

where?

woher?

asking for a origin:

where (from)?

wohin?

asking for direction:

where (to)?