Theory:

Alliteration:
The happening of the same letter or sound at the beginning of adjacent or closely related words.
 
Alliteration happens when words that start with the same sound (not just the same letter) are used repeatedly in a line or sentence or even a phrase. The sound is a consonant, and the words don't have to be next to one another.
Example:
1. Shut the shutters before the banging sound makes you shudder.
2. Go and gather the green leaves on the grass.
3. Please put away your paints and practice the piano.
Personification:
When you give an animal or object qualities or abilities that only a human can have, personification is what the poet's use to bring non-human things to life. 
Example:
1. My alarm clock yells at me to get out of bed every morning.
2. The avalanche devoured anything standing in its way.
3. Rita heard the last piece of pie calling her name.
Repetition:
In any poem, repetition is repeating words, phrases, lines, stanzas, or lines. Stanzas are groups of lines that are together. Repetition is used to highlight a feeling or idea, create rhythm.
Example:
American poet Edgar Allan Poe wrote a poem famous for its repetition. "The Bells" uses repetition to imitate the continual ringing of bells:
 
'To the swinging and the ringing
of the bells, bells, bells-
Of the bells, bells, bells, bells
Bells, bells, bells-
To the rhyming and the chiming of the bells!'
 
As you can see, the word 'bells' is repeated throughout the poem to increase enthusiasm and to create a memorable rhythm.
Imagery:
Imagery means using imaginative language to represent objects, actions, and ideas in such a way that it appeals to our physical senses.
Example:
1. It was dark and dim in the forest.
    The words “dark” and “dim” are visual images.

2. The children were screaming and shouting in the fields.
     “Screaming” and “shouting” appeal to our sense of hearing, or auditory sense.
 
3. He whiffed the aroma of brewed coffee.
    “Whiff” and “aroma” evoke our sense of smell or olfactory sense.