Answer:
Alliteration is the repeating of letters such as the phrase 'Harry hates hugs' and Consonance is the repeating of consonate sounds in multiple words such as 'Mike likes his new bike'
Step-by-step explanation:
It adds more effect in writing in poetry as it lures in the reader a lot more so that the poem stays interesting. So for example if you just sad 'I ride my bike' it would sound very boring but if you say 'Me and my mates ride minature motors' It sounds alot more engaging.
I really hope I helped and have a great rest of your day!! <33
-Zee :D