What copybook should I buy to practice hard-pen calligraphy?

Traditional Chinese character grid Tian Zi Ge: Tian Zi Ge includes four borders, a horizontal center line, and a vertical center line. The four grids are called upper left grid, lower left grid, upper right grid, and lower right grid. Rice-shaped grid: Rice-shaped grid is a grid with rice-shaped dotted lines printed in the square grid. It consists of a horizontal dotted line, a vertical dotted line and two diagonal dotted lines. It is mostly used for copying, and helps to arrange the positions of frames and strokes. The rice grid is also a tool for some primary and secondary school students to practice calligraphy, and there are even rice grid calligraphy classes. The third generation Chinese character practice grid with eight characters: The third generation Chinese character practice grid, a Chinese patented invention.

Chinese characters:

Chinese characters, also known as Chinese, Chinese characters, also known as square characters, are the recording symbols of Chinese and are morpheme-syllabic characters of ideograms. One of the oldest texts in the world, over 6,000 years old. In terms of form, it gradually changes from graphics to strokes, pictograms to symbols, and complexity to simplicity; in terms of the principle of character creation, it changes from form, meaning to phonetic sound. Except for a few Chinese characters (such as 瓩, 兛, 兣, 厎, 嗧, etc.), each Chinese character has one syllable.