Fang Nan and the three of them returned to Qingshan Village smoothly, and Hu Xiaoya, Hu Zhuang and others could put down their suspenseful calculations.

At this time, more than a month has passed since the autumn harvest, half of Fangnan's students have left Qingshanzhai to teach in other villages, and the second batch of students in Qingshanzhai has been enrolled, the youngest age is 12 years old, the oldest is 14 years old, and the teachers are Zhou Lei and his fiancée Zhu Qiaomei.

Zhou Lei, Zhu Qiaomei, and the people who left Qingshanzhai all have things to do, and the rest of the people, Fang Nan, also arranged one thing for them to do - casting clay characters.

Fang Nan's students still have to continue to study, but half of them teach in other villages, and can only learn knowledge through books.

According to the demand, Fang Nan needed to compile books on military, management, medicine, physics, chemistry and other aspects, and at the beginning each book had to be copied more than ten copies, and when Fang Nan's students became teachers, each book needed more copies.

If there are few books needed, just let the students copy them by hand, and there are too many books needed, so Fang Nan plans to use movable type printing to print books in batches.

Printing is one of the four great inventions of ancient China, and it is the emergence of printing that makes book knowledge relatively cheap and easy to disseminate.

At the beginning of printing, it was engraving printing, pasting a neat manuscript on a smooth wooden board of a certain thickness, and the front of the thin and almost transparent manuscript paper was attached to the wooden board, and the characters became inverse, and the strokes were clearly legible.

The engraving worker uses a carving knife to cut off the part of the layout without handwriting, which becomes the yang text of the font protrusion, and when printing, the ink is applied to the raised font, and then the paper is covered on it, and the back of the paper is gently wiped, and the handwriting is left on the paper.

However, engraving printing is very inconvenient, the engraving is one, once the engraving is wrong, the whole engraving is scrapped.

In the Northern Song Dynasty, movable type printing appeared, solved the inconvenience of engraving printing, compared with the fixed words of engraving printing, the words of movable type printing can be disassembled, and the general commonly used words are prepared with several or even dozens of them, in order to be used when the same edition is repeated.

Movable type printing is undoubtedly much more convenient than engraving printing, movable type printing is not only clay movable type but also tin movable type, wooden movable type, copper movable type, lead movable type, etc., in the case of Qingshan Cottage, the mud movable type is the most suitable, Fang Nan's students from the end of their studies to the present, basically have been ready for clay movable type printing, just waiting for Fang Nan to write out the book.

Before Fang Nan wrote the book, he took out some paper, ink, pen and inkstone and handed them to the students, so that they could practice calligraphy a little, after all, they used to write on the sand with wooden sticks, and there was still a gap between writing calligraphy and calligraphy.

While the students were practicing calligraphy, Fang Nan also began to write books, and the contents of the books were all memories in his mind.

Taking military books as an example, Fang Nan planned to write two books, one on the art of war and the other on military training.

In his previous life, Fang Nan was not a soldier or an officer, and he did not learn military training and command, but Fang Nan had read miscellaneous books about ancient military affairs, and also learned some modern military training methods from TV series and movies.

Fang Nan has not read famous military books such as "The Art of War", "Sun Bin Art of War", and "Kong Ming's Art of War", but Fang Nan has read "Thirty-six Strategies", mainly to see the examples in "Thirty-six Strategies" as stories.

"Thirty-six Strategies" or "Thirty-six Strategies" refers to the 36 strategies of the art of war in ancient China, which originated in the Northern and Southern Dynasties and was written in the Ming and Qing dynasties.

The book is divided into six sets, namely, the victory strategy, the enemy battle strategy, the attack strategy, the melee strategy, the battle strategy, and the defeat strategy, the first three sets are the strategies used in the advantage, and the last three sets are the strategies used in the disadvantage, each set contains six strategies, a total of thirty-six strategies, namely:

The golden cicada sheds its shell, throws bricks and leads jade, borrows a knife to kill, waits for work, captures the thief and captures the king, robs while the fire is fired, closes the door to catch the thief, Fishing in troubled waters, striking grass and scaring snakes, hiding the sky and crossing the sea, counter-plotting, hiding knives in laughter, holding sheep by hand, adjusting the tiger from the mountain, Li Dai Tao stiff, pointing at the mulberry and scolding the locust, watching the fire from the other side, blooming on the tree, secretly crossing Chen Cang, walking for the top, fake idiot is not crazy, wanting to capture the old and indulge, drawing salary at the bottom of the kettle, empty city plan, bitter meat plan, long-distance close attack, anti-guest-based, upper house ladder, stealing beams and changing columns, making something out of nothing, beauty plan, borrowing corpses to return the soul, striking east and west, encircling Wei to save Zhao, Serial schemes, false ways to cut down.

After each strategy, there are examples of historical occurrences, and at the same time, the book cites many previous war examples of the Song Dynasty and the incisive sentences of soldiers such as Sun Wu, Wu Qi, and Wei Yizi.

Fang Nan still remembered a poem composed by a certain scholar in the order of each word in the thirty-six strategies: Jin Yu Tan Gong Policy, to capture the thief, the fish and snake laugh in the sea, the sheep and tigers are separated by peach and mulberry, the tree is dark and obsessed, the kettle is empty and the guests are far away, there are beautiful corpses on the roof beams, and Wei Lian is killed.

"Thirty-six Strategies" is the art of war book that Fang Nan is preparing for students, just this one is enough, there are many differences between cold weapon warfare and hot weapon warfare, the army that Fang Nan wants to form in the future will be equipped with a large number of firearms, and it is better than the firearms performance of the Ming army, maybe there is no need for any strategy at that time, just move forward directly.

The art of war books have originals, and the training books are written by Fang Nan himself, including queue training, weight training, running training, etc., many of the content Fang Nan has used in physical education classes, and students have also experienced it themselves, and some people will use it on their own students.

There are two military books, and there are many books on other aspects, Fang Nan has a total of forty-two students, and the goal is to overthrow the Ming Dynasty, but Fang Nan did not think of training all forty-two students to become officials or officers.

For the time being, officers and officers only need a part of it, and scientists who study physics, chemistry, biology, medicine, etc. are also very important, and Fang Nan will train them according to the interests of students.

Physics, chemistry, biology and other disciplines are okay, but there are some troubles in medicine, Fang Nan does not have many reserves of medical knowledge in his mind, and Fang Nan only heard of his name in the "Divine Book" "Barefoot Doctor's Manual", and did not read it.

In medical books, Fang Nan can only write about common knowledge such as "water is boiled and drunk", and simple medical knowledge such as "wounds are cleaned and sutured with needles and threads".

This year is the eighth year of Wanli, and Li Shizhen's "Compendium of Materia Medica" was completed two years ago, and if Fang Nan's students want to learn medical knowledge, "Compendium of Materia Medica" is the best choice.

"Compendium of Materia Medica" can not be obtained for the time being, the medical knowledge of dealing with trauma must be learned, the two armies are fighting, there are many people who are traumatized, if they are not treated in time, there will be many people who lose blood and die, it is best for every soldier to learn the knowledge of cleaning wounds and bandaging wounds.