e2fsck reports errors. How bad are they and what should I do about them?

Code:

sudo e2fsck -f /dev/ubuntu/CoellHomeLV 
e2fsck 1.42.13 (17-May-2015)
Pass 1: Checking inodes, blocks, and sizes
Deleted inode 1573549 has zero dtime.  Fix<y>? no
Inodes that were part of a corrupted orphan linked list found.  Fix<y>? no
Inode 1573624 was part of the orphaned inode list.  IGNORED.
Inode 1573704 was part of the orphaned inode list.  IGNORED.
Inode 6816782 was part of the orphaned inode list.  IGNORED.
Inode 6816785 was part of the orphaned inode list.  IGNORED.
Inode 6816786 was part of the orphaned inode list.  IGNORED.
Inode 6817130 was part of the orphaned inode list.  IGNORED.
Inode 6817136 was part of the orphaned inode list.  IGNORED.
Inode 6817141 was part of the orphaned inode list.  IGNORED.
Pass 2: Checking directory structure
Pass 3: Checking directory coectivity
Pass 4: Checking reference counts
Pass 5: Checking group summary information
Block bitmap differences:  +529169 -(6325776--6325779) -(6327796--6327799) -(27425797--27425800) -28360197 -(28360200--28360203) -65116701 -(65117210--65117213)
Fix<y>? no
Free blocks count wrong for group #16 (23095, counted=23096).
Fix<y>? no
Free blocks count wrong (124293372, counted=124293373).
Fix<y>? no
Inode bitmap differences:  -1573187 -1573549 -1573624 -1573704 -6816782 -(6816785--6816786) -6817130 -6817136 -6817141 -15469970 -23333138 -23335442 -23335570
Fix<y>? no
Free inodes count wrong for group #1888 (8183, counted=8182).
Fix<y>? no
Free inodes count wrong for group #2848 (7990, counted=7987).
Fix<y>? no
Free inodes count wrong (32749843, counted=32749839).
Fix<y>? no

/dev/ubuntu/CoellHomeLV: ********** WARNING: Filesystem still has errors **********

/dev/ubuntu/CoellHomeLV: 18157/32768000 files (1.7% non-contiguous), 6778628/131072000 blocks