Alliteration - similar letters or sounds at the beginning of a word in a sentence(s)
Metaphor - a comparison that does not use 'like' or 'as'
Simile - a comparison USING 'like' or 'as'
Personification - giving human qualities to inanimate things
Onomatopoeia - referred to as extreme exaggeration.
Repetition will help a writer emphasize important ideas since repeatedly stating an affirmation will make the idea drastically more obvious and notable to the reader.