The card condition scale, honestly
Condition is the second-most important fact about any card after what it is. What each grade means, and how to grade your own.
Trading cards trade on a shared condition vocabulary: near mint (NM), lightly played (LP), moderately played (MP), heavily played (HP), and damaged (DMG). Marketplaces grade with these labels and price against them; the spread between adjacent grades on a valuable card can exceed the spread between rarities. Grading your own cards honestly is a money skill.
The four surfaces
Condition is assessed on four surfaces. Corners: sharp and pointed, or whitened, dinged, or rounded. Edges: clean color or nicked and chipped, especially on darker borders where wear shows first. Surface: scratches, print lines, scuffs, clouding, and fingerprints visible at an angle. Centering: whether the border is even front and back. A card is graded by its worst reasonable flaw, not its average.
The grades in practice
Near mint looks pack-fresh at arm's length — minor production imperfections allowed, no wear. Lightly played shows slight edge whitening or a small surface scuff under inspection. Moderately played carries visible wear: shuffle creasing that does not break the surface border-to-border, multiple whitened edges, or noticeable scratches. Heavily played means creases, marked borders, or substantial surface wear — playable in a sleeve, priced accordingly. Damaged is anything structural: tears, water damage, bent cards, hole punches.
From here, two paths: selling (pair this with the fees comparison) or professional certification for your best cards (the grading guide covers when that math works).