What do wovon, worüber, wonach and all those other ones mean?
They are question words such as woher and warum.
Structurally, they are formed using a wo- and a preposition.
But what do they mean?
When do I need these converted question words?
Don’t focus on the ‘where’ meaning of wo. In fact, forget that wo means ‘where’ and imagine it's a ‘question word converter’, meaning that it takes a preposition and converts it into a question word.
Whenever you want to ask a question using verbs with fixed prepositions like träumen von, suchen nach, diskutieren über. In English, you would rather say what for, what about, ... in German, ...
These wo-words are only used for questions for which a thing is the answer, not a person.
- Ich warte auf den Zug.
- Auf wen wartest du?
- Ich warte auf meine Freundin.