This is about dealing with a research paper : be a good reviewer : be critical
You have to explain :
The context of your paper:
what was done before the paper, why something had to be done (what for),
the critics against the other solutions, what the author has done before
on that subject ...
Here, it could be interesting to provide references to other documents
(other articles, books, web sites) that help you to understand the paper
you have read
The content of the paper:
what you have done, what are the interesting new elements, new developments,
new ideas that make your work so "special"
The follow up:
what new directions could be followed, what things could be done, using
what you have just presented.