we should focus on just its movements like when the price increase we should buy and when it falls we should sell. It's all about knowing the perfect time to take steps about altcoins.
I believe the same things are applicable even when you're trading bitcoin against fiats. I mean these watching price movements and finding right time to react are common even for bitcoin trading.
We need to remember the competitions in crypto trading is not like the early stages of its market. After the introduction of derivative exchanges, the crypto trading volume has significantly increased which means if you're not alter enough then you will simply miss out your entry and exit so cheaply. On this regard, there is no big differences between trading altcoins and trading bitcoin.