This may help:

https://www.youtube.com/watch?v=cQK0DritNvU (speaker with southern 'R')

https://www.germanveryeasy.com/interrogation-in-german (speaker with northern 'R')

Don't waste your time here -) ... Go there:

Look at the numbers of questions, answers and views! - Convinced?

This here is mainly a wedding market... (sigh!)

Cheers!

When I read the title I thought "Yeah, now that you say it... Why are things so complicated in German?"

But what perhaps few learners know is that many native speakers often use "für was, von wo, mit was, über was, ..." in colloquial German instead of "wofür, woher, womit, worüber", but this only applies to question words. Most Germans would consider forms like "für das, über das" incorrect.

Hier mal ein etwas umgangssprachliches Beispiel:

"Was hältst du davon?" (So, what do you think about that?)

"Wovon?" ("About what?" (I don't know what you're talking about))

"Na, von seinem Vorschlag von gestern!" (You know, (about) his suggestion from yesterday!)

It's also interesting to know that "damit" has different meanings depending on which syllable is stressed (this means: depending on whether you say DA-mit or da-MIT).

DA-mit (=with that)

"... Und damit wären wir fertig." (... And with that, we're done)

da-MIT (=in order to, so that)

"Ich habe dir einen Wecker gekauft, damit du nicht wieder verschläfst" (I bought an alarm clock for you so that you don't oversleep again)