Answer:
For writing poems, pick something you like to do, like a hobby, and explain what you love about it and explain what you feel when you do it.
For the sound devices, onomatopoeia is something like, POP or CRASH or BOOM, that would help the reader sound visualize.
Ex: I️ love playing hockey,
When I️ skate around
The court I️ hear
The SKSHH of
The ice
Ex2: Music is wonderful,
When I️ play I️ express
My feeling and thoughts
The BOOM of the bass
Drum of the TOODLE of
The flute.
Alliteration examples and how you can incorporate it into your writing...
ex of alliteration:
Sally sold seashells by the seashore
Or
Peter piper picked a patch of pickled peppers
Using it in you writing...
Ex: Hockey hops with a hunger (idk)
Ex2: Sounds through the ground from the side of the ceiling
Hope I️ helped a bit ;)