compendious — giving a lot of information clearly and in a few words; brief but comprehensive

a professor holds up a single thin handbook while gesturing confidently to a packed auditorium. The small book contains everything the students need to know for their entire course. Students lean forward with surprised expressions as they realize this compact guide covers all the massive textbooks stacked on their desks. Several students flip through the thin pages with amazement, comparing it to their heavy course materials. Other students nod appreciatively as they discover how much information fits in such a small package. giving a lot of information clearly and in a few words in a brief but comprehensive way