Creating key words to help remember something involves three steps - 3 Rs:
1) Recoding the new word to another word (which will be the key word) that sounds similar to the new word
2) Relating the keyword to a image that is associated with the new word
3) Recalling the new word and definition by thinking of the keyword and the picture
Example: Is it the radius or the diameter?
(The "radius" is a line from the center of the circle to the edge. The "diameter" is a line from edge-to-edge passing through the center.)
Recoding: Radish sounds like radius. Radish is the key word.
Relating: Create an image of a radish swinging from the center of a circle like a pendulum.
Recalling: When someone mentions "radius" in the future, the sound of that word should remind you of radish and the image of a radish swinging inside a circle should pop into your mind.
The radish is swinging back-and-forth from the center. Thus, "radius" means the distance from the center of the circle to the edge. Easy, right?
Study the image for a few moments. With this silly picture in mind, could you ever again confuse radius with diameter?
Another Example: Who was a famous Hungarian pianist?
(Bela Bartok)
Recoding: Bela sounds like bell. Bartok can be taken apart into two sounds, bar and talk. The key words are bell, bar, and talk.
Relating: Create a crazy image of a large bell talking to people in a bar in Hungary while it is hitting the piano with an iron bar.
Recalling: You can use this to remember that Bela Bartok as a pianist or that a Hungarian pianist was Bela Bartok.
More Information - Diving Deeper Videos
Webster Ku's How to STUDY the EASY & EFFECTIVE way? "KeyWords" the Secret to study less & still Score A's Video