It looks like you’ve created a partition for Linux - you need to delete this partition. Leave it as “unallocated” or “free space”. Then the Fedora installer will see it as space it can install to. The installer will handle creating the actual partition.
Standard Dynamic Range. It’s a term adopted to differentiate non-HDR video from HDR video.
The quotes are there because there’s spaces in the file name. You don’t see them in the GUI because they’re not actually there. They’re added by the ‘ls’ command to help with copy/pasting of file names. You can add ‘export QUOTING_STYLE=literal’ to your ~/.bashrc to permanently suppress them, or just do ‘ls -N’ as a one off.
7000 series run AVX512 as two 256 bit data paths, while the 9000 series has a native 512 bit data path for AVX512.