The most important thing when trading is to understand the trend that is happening, and making several sites for reference and making decisions is the best thing, now I use coinmarketcap as a reference because there is already a selection of the most profitable coins daily, weekly and monthly, and this simple technique makes I can earn big.
The most profitable sections is not a recommended thing to be a investment reference, since its only a rank of gainer that already passed. For example if you invest on rank 1, which already gain 70% in 24h, its probably on the peak and wont rise anymore, it probably goes to be loser in the next day.