I have a basic understanding of fsck utility but what does fsck section in /etc/fstab denote? It has values 0, 1, 2 what are these values? Googling says 0- it wont be checked              1- will be checked on boot              2- Now what is it? 
What is in fsck section in fstab?
fsck;fstab
From the fstab(5) man page:   The sixth field (fs_passno).          This field is used by the fsck(8) program to determine the order          in which filesystem checks are done at reboot  time.   The  root          filesystem  should be specified with a fs_passno of 1, and 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.  If the sixth field is not present or          zero, a value of zero is returned and fsck will assume that  the          filesystem does not need to be checked.