What do the instructions that were given to the students when visitors were expected tell you about the students' families and their circumstances?

Hello. You did not provide the instructions and showed the text to which this question refers, which makes it impossible for it to be answered accurately. However, I will try to help you.

If children need school instructions on how to behave in the presence of a visitor, it probably means that these children have very socially marginalized families, who do not get enough knowledge to promote a behavioral education for their children, as they have had few opportunities to learn this type of education.

often a noun phrase is just a noun or a pronoun:

people like to have money.

i am tired.

it is getting late.

two factors or characteristics of a chapter that might make it difficult to read would be words i don't understand, or if i don't fully understand what's going on in the chapter. strategies i can use to get through the difficult material would be a dictionary, and re-reading previous chapters to get a better grasp of what the author is trying to say.