Take this into account when holding Alts for the medium and long term, and of course choose them carefully. What kind of Alts are recommended for the long term? Remember, this is only when there is a reason for making a trade. The projects/coins that have a higher daily trading volume and which have a widespread community behind them, with continuous development, are here to stay with us:
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.