Japanese elementary schoolers learn this kanji in the first grade. It is easy to remember because it resembles what it represents - The kanji 金, looks like treasure in a chest, shining brightly.
You call a rich person, o-kane mochi, or literally holder of the gold.
O-kane mochi - rich, wealthy
お金持ち
You call a poor person bimbo^.
bimbo^ - poor
貧乏
