Several problems about calligraphy:

Usually shelves and structures are placed on the ground, which generally refers to the composition and interspersed style of Chinese characters. Structure is the form of each part of a word, such as upper and lower structure, left and right structure, etc. Shelf usually refers to a single word (without radicals), such as the vertical height of the word "Zhong". Calligraphy is an art that pays attention to the beauty of Chinese characters. Of course, the frame structure should be studied as an element of Chinese characters together with strokes. And when you say payment, you usually mean outside the text. For example, "Inscription" refers to the title before the text (generally for what), while "Inscription" refers to the end of the text, indicating the author, time and place.