I wanted to watch Netflix in the Probemonat but you have to (of course for security) deposit a payment method. I thought about credit cards, but now I wonder how far you can trace it back.
As far as I've heard is to check 1 cent or Euro somehow "reserved"?
Does this amount appear somewhere on the bill or elsewhere?
No, nothing is "reserved" there. The account details you have to specify, if you do not cancel your trial subscription again in time, of course, the monthly rate for the next month will be deducted.