Poe dresses Fortunato as a fool because he followed Montressor into the catacombs in hopes of sampling a rare bottle of wine which are the actions of a fool. In the end he allows Montressor to manipulate him and kill him without realizing the real intentions of his "friend" until it is done
Yes, as he found it difficult to comprehend the things he was surrounded by. He was curious about his father, and yet, he was frightened by the things his father was excited to show him. Moon Shadow was uncomfortable and frightened by the electric light, the ear phones, the crystal set, the strangely constructed machines, all of which he believed to be some kind of magic.
"I didn't say anything, but father realized I was scared from the way I was shaking.”
A poetic device is a tool that serves different purposes in a poem. Some of them are ornamental, some enhance the meaning of the poem and others add to its rhyme and lyricism. The most common poetic devices are alliteration, repetition, metaphor, simile, personification, etc.