The safest way to buy is to measure the intraday interval . ...

The safest way to buy is to measure the intraday interval . Every stock has its unique maximum UP and DOWN of the day before seeing a change of trend during the day.
The thing to take note for volatile is : how high /low can it go when is a downtrend,uptrend or neutral day .
Buying : From there , you are already getting it at the safest and lowest point, all you got to do is wait longer and then sell

Selling : Give self a good estimation and plus a small amount to sell off.