I prefer the common trading strategy of buying low and selling high. It is not that possible every time. We need to study the market and should make the trading strategies accordingly. In specific even when the market keeps on fluctuating which can be used for marginal trading.
Of course, it's a common sense and you ultimately have to do that in order have profit, but strategies differ on how you do it. As in if you do tons of small trades with small profit or do trades within one day or over the course of few days or over a really long period of time, switch between echanges, rely on some tools, use levrage or just rely on yourself etc.