I have certain target prices where I start to really watch a particular coin. For example, I like ETH in the low 0.04's, LTC in the low 0.008's, ZEC under 0.03, and DASH around 0.05. Those are what I eyeball the most but I also watch DOGE, DGB, DCR, SYS, and a few others. I really like to load up on DOGE below 20. My best method for trading is to see what coins hold their value when Bitcoin starts moving up a lot. For instance DOGE stayed in the 15-18 range when Bitcoin went from $4k-$8k so that was a strong buy signal for me. Good Luck and I hope you do very well!