Market value (market cap) is the price times the coins in circulation. It ranks the list; it does not say a coin is good or safe.

ATH (all-time high) is the highest price ever; the last column shows how far below it the price is now. Stablecoins aim to stay at $1, so for them it shows their lowest price, the biggest depeg CoinGecko has recorded (a short drop on one exchange can count). Funds aim to stay steady, so for them it says “steady”.

Wrapped and staked copies of a coin, like WBTC or stETH, do not take a place in the 200; they are named under the coin they copy.