Yes as per first comment, you can get full details with
man fstab, or the command to display the reference manual page for
fstab (file system table).
man fstab will tell you
The fifth field (fs_freq).
This field is used by dump(8) to determine which filesystems need to be dumped. Defaults to zero (don't
dump) if not present.
The sixth field (fs_passno).
This field is used by fsck(8) to determine the order in which filesystem checks are done at boot time.
The root filesystem should be specified with a fs_passno of 1. Other filesystems should have a fs_passno
of 2. Filesystems within a drive will be checked sequentially, but filesystems on different drives will
be checked at the same time to utilize parallelism available in the hardware. Defaults to zero (don't
fsck) if not present.
Field 5 is the dump parameter (use 0 as it's very rarely used)
Field 6 is a
fsck (file system check) parameter for ordering; 0 usually for key system drives, 2 for less system-critical data drives.
Rather than a device (/dev/sdb1) I'd suggest using the UUID (unique ID) which you can get from
blkid once formatted; I'd also use ext4. sda = first drive, sdb=second drive, the number is partition - but these values can change if you change BIOS/UEFI/settings or add/change hardware.
guiverc@d960-ubu2:/var/crash$ sudo blkid
/dev/sda2: UUID="4f59600e-1f6b-4e3a-a466-941a2168e327" TYPE="swap" PARTUUID="6c8394c6-02"
/dev/sda1: UUID="afa7971f-3dd5-4b30-9c98-0af3e56a6f2b" TYPE="ext4" PARTUUID="6c8394c6-01"
/dev/sda4: UUID="06863296-81b3-4263-8665-21f1864fa399" TYPE="xfs" PARTUUID="6c8394c6-04"
/dev/sda5: UUID="5b4267e5-8b90-4f6b-84b0-c4ee9d5e104d" TYPE="ext4" PARTUUID="6c8394c6-05"
/dev/sda6: UUID="ba0dca2e-0799-4340-b565-a649842c8a69" TYPE="xfs" PARTUUID="6c8394c6-06"
results in a file system entry for one of my partitions as
UUID=ba0dca2e-0799-4340-b565-a649842c8a69 /more xfs defaults 0 2
/more is what I've called "more space", which in my case is an encrypted (XFS not EXT) home partition for my other [dual-booted] Ubuntu system. The UUID or Universally Unique Identifier being much more exact than sda6 which is all
lsblk would tell me
..redacted as only for example ..
└─sda6 8:6 0 53.8G 0 part /more