1.
key point, important aspect
The essential or important part of something. Used when highlighting what matters most.
2.
reward points, loyalty points
Points accumulated through purchases at stores or services, redeemable for discounts or rewards. A major part of Japanese consumer culture.
Usage
Sense 1 is extremely common in presentations, explanations, and advice-giving. ポイントを押さえる (to grasp the key points) is a high-frequency expression.
Sense 2 reflects Japan's extensive loyalty point culture. Almost every store and service offers a point system (楽天ポイント, dポイント, Vポイント, etc.).