Bitcoin trading is on of the best way for making profit by using of buying low and selling high. There are two main methods for gaining from the market also people always use to analyze Bitcoin price first on is fundamental analysis and second on is technical analysis. Every successful trading requires a lot of time, money and effort before you can actually get good profit from the market. So you need to learn which price you by and which price you sell using your analysis.
A lot of general rules, none really useful in real life. TA doesn't work alone in a lot of cases. Without a proper plan, FOMO, greed, FUD will play with any trader wannabe's mind and will make him sell lower than he bought.
One needs to make sure he affords to lose the money he's playing with. One has to have proper safety nets (stop orders) and watch the market closely.
Also one can easily just follow the trend and when it's sure enough that it's going upwards, buy and sell later.
However, my experience has shown me that in many cases, HODL and patience gives higher return with much less effort. Of course, HODL is also not an universal solution.