Finding the main idea
The main idea is the central point a writer is making. Every other sentence in the passage is there to defend, explain, or illustrate it.
How to spot it
- Read the first and last paragraphs first — main ideas often cluster there.
- Ask yourself: "If the writer could keep only one sentence, which would survive?"
- Beware of detail traps: a true detail is not the same as the main idea.
Example
Most students think note-taking is about copying what the teacher says. In fact, the most useful notes are short, paraphrased, and reorganized in the student's own words. When notes become a copy of the lecture, they lose their power as study tools.
The main idea is "useful notes are short, paraphrased and reorganized" — not "students take notes" (too broad) and not "students copy lectures" (a detail).