Agreed with the majority of posts: Buy low, sell high / buy on the dump, sell on the pump / buy on fear, sell on the news / etc.

I buy dips.
I buy during accumulation phases for alts.
I long BTC and will hold it for days to weeks, depending.
I don't chase pumps, especially if a coin is up by 100%.
I buy based on altcoin fundamentals and chart history--if there are many arguments and a lot of volatility, I'll take interest.
My targets are based on trend riding, and using the FIB ext and retracement tool.

Everyone's trading style is different though, I tend to lean toward the more "swing" type of trading.