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, everyone should be buying low and selling high but the problem with that alone is to know if you are really buying low and if you are really selling high which I believe so many people always find pretty hard as a decision to make. Some have actually bought higher and then ended up selling lower as a result of panic while trying to buy low and sell high without using indicators to confirm their decisions.
It is important to always have a strategy with the help of the indicators for analysis and then stick to it.