Revising your paper allows you to

finish your work
fix spelling errors
improve your final draft
make the last changes

mi hermana "sabe" bailar salsa. "conoces" tu el monumento la mitad del mundo? raul y yo sabemos al profesor de matematicas.

translated: my sister "knows" how to dance salsa. "do you know" the monument half of the world? raul and i "know" the math professor.

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.