Those who can read try to read the words, those who can't try to understand the images, then listen carefully as the village chief explains, writing notes and comparing them against the manual.
Furthermore, households with children show the manual to them, asking them to teach the adults the words, or have the children read aloud to them—striving to memorize even if they cannot read, to fully grasp the knowledge in the book.
In the civilian population, there is the "Common Doctor Manual," and within the army, there is the "Military Doctor Manual," learned in units.
Learning within the army is much more convenient than among civilians, and also more detailed. Besides the class leader teaching, there is a major lesson every ten days where the entire army listens to lectures directly from military doctors.
This equates to battlefield first aid knowledge; learning this ensures that even if military doctors can't arrive in time during battle, comrades can save each other.
