buy low and sell high is one of my best strategies. but I prefer to use technical analysis for it.i also use proper stop loss at my trade, because without stop loss a coin can dump a lot and i may lost all of my capital or stuck at one coin. also it is very important to do fundamental analysis before taking any trade. I also follow some top trader at tradingview and take knowledge from there chart. in this way I tried to stay risk free at my trade or i take very low risk at per trader.