Answer:
Number 1: He doesn't know if he'll be accepted there.
Number 2: He is afraid of the Sorting Hat landing him into Slytherin.
Number 3: He doesn't know basic spells, potion recipes, etc..
Number 4: He's afraid someone might catch him walking through the wall in platform 9-3/4.
Explanation:
"A Wedding Gift" is best considered a tragedy. Due to the sadness of it being placed around from a court case in the 1840s.
Answer:
The theme of this story is that not everyone gets a happily ever after. We continue to go through trials and tribulations that test us and how grounded we are. There is no one moment which leads to peace afterwards.