At the moment I am just seeing them on Coinmarketcup and would like to start selecting them by the exchange they are listed.
So I would like to understand if the exchanges are good or not.
How should I interpret the volume and liquidity values for the exchanges?
Since you have seen them on crypto coinmarketcap means they have significant volume even though the market cap is still low. I assume the tokens you saw is probably traded on uniswap since most presale now started with a little few less liquidity. Uniswap is good and can easily be recognized for volume this could increase depends on the project. Some others consider a low cap a potential gem.