When you write anything, you choose your letters from two different alphabets ... big letters and small letters.
The small ones look like this: a-b-c-d-e
The big ones look like this: A-B-C-D-E
The big ones are called "capital letters".
When you have to write a letter and you decide to use the big one, you "capitalize" that letter. It just means that you write it with the big one.
In English, you always capitalize the first letter in a sentence, and the first letter in a name.
I was looking forward to spending time with my cousins last summer.
Simile and imagery
Hughes is using simile in this poem to compare what happens when you put off dreams. He compares deferred dreams to things with very strong sensory imagery like drying up "like a raisin in the sun" or stinking "like rotten meat". These details help the reader understand the heavy impact of what will happen if you put your dreams on hold.
Answer:
#1=" Turpentine and onions garnished with a gym sock."
#2=It is telling how stinky it is.
#3=It makes the author's message stronger by telling what it smells like.