Students can be asked to highlight or underline key points in a text.
Example
The learners listen to a talk from an outside speaker on how to do a parachute jump and note the key points. They then check these together and write an article for their class blog.
In the classroom
One way to help learners develop the skill of identifying key points in texts is by not giving them too much time to read (and so to start focusing on detail). Reading races, timed readings and reading exam practice questions can encourage learners to find key points as quickly as possible.
Further links:
https://www.teachingenglish.org.uk/article/teaching-reading-esol-classroom
https://www.teachingenglish.org.uk/article/activities-using-magazines-classroom
https://www.teachingenglish.org.uk/article/unit-4-reading-skills