You can get a lot of data information from coinmarketcap, but that doesn't mean you can make a lot of money from trading because many of those coins are not worth to buy. But sometimes, you can get hidden gems that will worth and will help you to make a lot of money. Each coin you get needs to be analyzed before you buy at the market and if you can select from the higher list, then you might make a profit later. But once again, that will be difficult to analyze one by one before you can find the potential coins. You should buy the cheap coins but have a good list in the coinmarketcap, and in the market, the coin has a good volume to trade.