Trouble with audio recording

Hi everyone,
I’m currently struggling on recording from the audio jack, which should be possible, no?
I installed Debian and am perfectly fine playing sound files with “aplay”, but using “arecord” to capture data from my microphone just produces static noise. I’d guess that I somehow need to switch from playback to capture but after hours and days of searching the internet and trying different things, I still made no progress.
So, can anyone of you help me with that? I hope it’s a simple task, just complicated by my inexperience.

Best regards,

I would just like to also add that I’ve similarly not been able to make the microphone jack work.

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