Your college courses provide a wealth of information. Identifying the main ideas is a crucial factor in narrowing that amount of information so it can be more easily studied. Finding main ideas will prioritize the information you receive. Main ideas deserve your intense study. Supporting information is of less importance after they broaden your understanding of main ideas.
A good way to assure your understanding of a paragraph’s main idea is the following. Find the paragraph’s main idea and write a question that can only be answered by an understanding of it.