How to write the formula?

The writing of the formula is divided into: point? , lateral point, vertical point, skimming point, picking point, and long point.

(Side-point writing): Start with the pen and bend gently, then return to the middle. ?

(Vertical point writing): Like the side point pen, use the pen in the opposite direction. ?

(Apostrophe writing): Start the pen with a heavy bend, and gently lift the pen to close the nib. Its light and heavy change is opposite to the vertical point.

(Pick a point to write): Start to tilt hard with your right hand and gently lift the pen tip. ?