The major problem they usually face is related to having too much poorly structured information in their papers.
If a topic is less important, write about it last and write fewer words on it.
Have you ever started writing an essay then realized you have run out of ideas to talk about?
The opening should contain the thesis statement which can be two to three sentences long, comprising a summary of the main points and/or arguments presented in the essay.
The manner in which you write your introduction will help the reader decide whether they would like to proceed with reading the paper or just stop right there.