Back and front: Take the vertical dew as an example, the pen collection place should be recycled lightly, that is, back and front.
Sideways: It means the same thing as yawning. When writing, the pen tip is on one side of the stroke rather than in the middle. This is the flank.
Out front: the strokes at the pen receiving place are sharp, for example, the needle can hang down and the tip of the pen tail is out front.
Side potential: Generally speaking, this word is a bit crooked. Of course, some words in calligraphy are beautiful.
Shun Feng: Contrary to the reverse feng, the reverse feng often requires you to turn right first and then left, while Shun Feng starts writing directly along the stroke direction.
The above is just a simple explanation. You can ask me if you don't understand anything. If you have time, I can give you an example with pictures. I hope I can help you.