Windows Repaired drive C on boot  

Hello,

I noticed on boot that Windows did some sort of repair to drive C: I didn't manage to see it completely because I came exactly when it finished. It said something about Repairing or Fixing drive C:

Now it's a new Samsung 970 Evo NVME. And this drive is already a replacement of another brand new NVME of the same type.
I just want to know how to check in Windows the cause for it, or the logs of this repair

Because I want to know if it was just because I shut down my PC not properly (I shut it down by long press during boot because I wanted to remove a PCIE device). Or my motherboard is frying NVME's, or just another faulty Samsung drive

When you want to avoid hybrid shutdown and do a complete shutdown press Shift+Shutdown.
Pressing the Shift key tells the PC to do a full shutdown rather than a hybrid shutdown which means it fully closes all apps and logs out all the users. It is a complete shutdown.
As you did a forced shutdown you have corrupted some files on the drive.
Retrieve the check disk log to see what was fixed.
Read Chkdsk Log in Event Viewer in Windows 10