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.
An appropriate topic matches the interest and expectations of the audience :)
The correct answer is mysterious
I honestly have no idea what that is
Resolution
rising action
exposition
climax
falling action