I always do that before buy any cryptocurrency. I have a cousin who invest in bitcoin too. The different is he is still a newbie in this bitcoin investment. He only buy when the price chart fall and sell when he see the price go up, he seems didn't do any identification and formulation. The result is he can gained 100% profit while I gained 400% profit. Basically he buy any coin that the price is falling, he think that those coin price are cheap. In my opinion, strategy, fundamental and technical analysis are very important in cryptocurrency investment.