Once you have narrowed down on cryptos with high daily trading volumes, focus on their historical price movements. The best way to do this is to use a financial ratio known as the Sharpe ratio.  Don’t worry about calculating it, since you can easily find it online.  The Sharpe ratio measures the potential return of an asset based on its volatility.  Figures higher than 1 are usually a sign of an asset with high potential returns. Given that cryptos had a stellar year in 2017, most of them have a Sharpe ratio of higher than 1.  Therefore, for you to make use of this ratio, narrow down on cryptos that have the highest Sharpe ratio relative to the rest of the market to Profitable Cryptocurrency Trading
Always pay attention to Bitcoin. Most altcoins (every cryptocurrency except Bitcoin) are pegged more closely to Bitcoin than Asian currencies were to the USD during the Asian Financial Crisis. If Bitcoin price pump drastically, altcoins price can go down as people try to exit altcoins to ride the BTC profits; inversely, if Bitcoin prices dump drastically, altcoin prices can go down, too, as people exit altcoins to exchange back into fiat. The best times for altcoin growth appear when Bitcoin shows organic growth or decline, or remains stagnant in price.