What are the good explanations for the interpenetration and avoidance in regular script calligraphy? And scientific practice methods?

If you practice the law, I think it's best to use Jiugongge. It can not only accurately grasp the center of gravity and make it stable, but also make the stroke distribution reasonable and uniform in length and density. As for interpenetration and avoidance, there will be an alternating effect of reality and reality. The center should be compact, the width should be inserted between the top, bottom, left and right, strokes should be avoided, and strokes should be inserted between spaces to achieve the perfect state of harmony and unity.