Similar to investing, diversification is king. To lower possible trading risks, it’s better to distribute your money into different cryptocurrencies. While some grow, some will fall and by not putting all your money on single bet you can balance the losses. That said, trading requires research and tracking changes and there are a lot of cryptocurrencies — which means a lot of research. Start with a few and expand slowly.
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.