You might remember the meaning of the character 商 with this easy mnemonic:
To enter the chamber of commerce, you have to put a lid (亠) over your eyebrows (丷), kneel down in that box (冂) and count to eight (八) with your eyes and mouth (口) shut. It's a really strange ritual.
Using mnemonics to remember the meaning of Chinese characters like has a huge impact on how long to learn Mandarin it takes.