vmlinuz on the / partition is a symlink to the latest kernel (same goes for /initrd.img which is a symlink to the initial ram disk of that latest kernel). For instance on my laptop
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$ ls -l /vmlinuz
lrwxrwxrwx 1 root root 30 Oct 1 16:32 /vmlinuz -> boot/vmlinuz-4.15.0-65-generic
So writing the option that way, you are sure that you will always boot the latest kernel.
Small caveat is that the symlink might get broken (I have never had the case, but conceivably this could happen during a failed kernel update, if you reboot before fixing the update).
"quiet" (usually used in conjunction with "splash" which displays a splash screen) is an option to tell the kernel to be mostly silent. i.e. it will not show on screen all the messages that it normally shows to inform where you are in the booting process. It will only display error messages if any.
I dont know what the "elevator=bfq" option is. Maybe a bit of search on the net will inform you better. It has been put by hand by the writer of the reddit post you linked to. I have never used it and doubt you will need it unless you have a particular problem to solve. For a standard Linux Mint install, the only options passed to the kernel are "quiet splash".
But again, why do you need to make a manual entry ?
(except for satisfying a geeky desire to understand the boot process, which I perfectly understand)
You will get rid of some of refind's goodness : the automatic detection of the kernel (and initrd), the easiness of maintenance, and the option to easily boot older kernels.
If it's to get rid of some of the other booting options present on the refind screen (like in the reddit post), it's much more easily achieved via the dont_scan_files etc options in refind.conf.
If it's to pass on some specific kernel options, an easier and maintenance-free way is to have a /boot/refind_linux.conf as explained here
. There is a refind script (
) that can automatically create this file.