The question asked is "What are the three stages of calligraphy development?" The initial stage, the mature stage, and the peak stage.
1. Early stage: From the Yin Shang Dynasty to the mid-Western Han Dynasty, people began to use brushes to write on bamboo slips, silk and other materials. The calligraphy art style of this period was relatively simple and focused mainly on practicality.
2. Maturity stage: From the late Eastern Han Dynasty to the Wei and Jin Dynasties, the art of calligraphy gradually matured, and many famous calligraphers and works appeared. Calligraphy styles at this time were diverse, including simple seal script and official script as well as smooth running script and regular script.
3. Peak stage: From the Tang Dynasty to the end of the Qing Dynasty, during this period, Chinese traditional culture reached its peak. Many outstanding ancient Chinese literati emerged and produced many outstanding works. This period demonstrated a rich variety of font styles and techniques, and there were also novel innovations based on the inheritance of classical traditions.