Kane or 金, is defined as 1. a metal, 2. money; cash; a coin.
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.
This the mnemonic image from the Dr. Moku Kanji App.
You call a rich person, o-kane mochi, or literally holder of the gold.
O-kane mochi – rich, wealthy
You call a poor person bimbo^.
bimbo^ – poor
Learn more essential Japanese language points here.