For the first point you can't catch accurately the bottom you don't know when exactly it will increase or decrease due to the market unpredictability and sudden fluctuations you re lucky if you spot the bottom then the price goes up after that, the Second one you can't also tell how long it will stay on that state if rise so it is your call to sell or not, the third point seems applicable for long-term holder and investors day traders must observe the charts daily.