My trading strategy is that I will buy coin when the value is low and sell it in a high value. It could also hold the it until the price is high. It needs close monitoring everyday and time to time because the value is changeable.
I usually buy in pots with strong and strong community, usually the altcoin in the top 20 on coinmarkercap, I will buy when the market plummet as today. After that I will keep in 2-3 months time, I usually sell at the end of the year because it is the most cryptocurrency time market growth.