What does it mean "do not judge a book by its cover"?

In 1808, their friend, the romantic poet clemens brentano, asked them to collect all types of folk tales so he could use them in a book of literary fairy tales. in 1810, they sent him fifty-four texts, which they fortunately copied. fortunately, because brentano then lost the manuscript in the ölenberg monastery in alsace and never used the grimms’ texts. when they realized that brentano was not going to use the tales, they decided, upon the advice of another romantic writer and mutual friend, achim von arnim, to publish their collection. it had grown to eighty-six tales, which they published in 1812, and then another seventy, which they published in 1815. –“how the grimm brothers saved the fairy tale,” jack zipes what structural technique does the writer use in this passage? the writer describes events in chronological order. the writer describes events in their order of importance. the writer provides a central idea and then lists examples. the writer shows how the grimms made mistakes and then solved them.