I am practicing running script. Could you tell me when to press "turn" with a circular curve and when to press it with a flat curve? Thank you for your advice.

The name "Qu Si" is unscientific. Most people know the method of shorthand for running script, but there is no such writing method for regular script. If you write a running script with Qu Si, it is also for the pursuit of change. For example, in order to avoid repetition, or according to the needs of the upper and lower figures, there is no fixed method and we cannot act dogmatically.