Stamps for sale are in good condition unless stated otherwise specified.
For cancelled stamps, the image corresponds to what you ordered. The cancellation will be exactly the same as that of the photo. This is a tedious job to scan, but a satisfaction guarantee for the buyer
In the case of a stamp with hinge, the hinge is generally cut short and not withdrawn. This is to prevent damage to the stamp verso.
Abbreviations contained in advertisements for stamps:

BE (good condition)
BL (block)
DEF (defects)
(stamp number in catalog Yvert & Tellier)
NF (unused)
OB (cancelled)
PA (airmail)
PR (precancelled)
SG (without gum)
TBE (very good condition)
TC (trace of hinge)
TD (stamp of distributor)