The key points of a spoken or written text are the most important points. The learners listen to a talk from an outside speaker on how to do a parachute jump and note the key points.
A quick search on Stack Overflow suggests that "keypoint" as a single word is in reasonably common use. On the other hand, google searches combining "keypoint" or "Key point" with other image processing terms seem to suggest "keypoint" is somewhat more commonly used. Both are used in academic papers.
Key Terms means the portion of a Cover Page that includes the key legal details and definitions for this Agreement that are not defined in the Standard Terms. The Key Terms may include details about Covered Claims, set the Governing Law, or contain other details about this Agreement.
Meta can be used as an acronym for “most effective tactics available,” and calling something “meta” means that it's an effective way to achieve the goal of the game, whether it's to beat other players or beat the game itself.