So if you have two actual HD’s you can install linux on one and keep windows on the other without any issue of windows nuking the bootloader as long as you install the linux bootloader on the linux HD. In bios you select the linux partition to boot from and the linux bootloader should give you a choice of operating systems at boot.
Where you run into issues is when you are using a single HD and partitioning windows and linux on the same drive.
So if you have two actual HD’s you can install linux on one and keep windows on the other without any issue of windows nuking the bootloader as long as you install the linux bootloader on the linux HD. In bios you select the linux partition to boot from and the linux bootloader should give you a choice of operating systems at boot.
Where you run into issues is when you are using a single HD and partitioning windows and linux on the same drive.