The document introduces several key concepts of agility including: 1) Agility is a mindset and method that focuses on iterative and incremental development, delivering minimal viable products frequently to get early feedback. 2) The Pareto principle emphasizes focusing effort on the 20% of causes that result in 80% of the effects. 3) An agile approach involves splitting work into small deliverables, prioritizing by value, and delivering in short, fixed iterations to inspect and adapt based on feedback from customers.