Article 6GKWB Debian I had destroyed grub

Debian I had destroyed grub

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beginstart
from LinuxQuestions.org on (#6GKWB)
I am using Debian 11 and 32 bit and I think I made a terrible mistake.
I am newbie with Linux and so maybe I did destroy the system-files.
What files shall I post here to find the problem?
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