You might remember the meaning of the character 税 with this easy mnemonic:
In the olden days, you had to pay taxes with grains (禾), and if you were late on your payment, the king would shave off your eyebrows (丷), or even worse, sew up your mouth (口) or cut off your legs (儿)!
Using mnemonics to remember the meaning of Chinese characters like has a huge impact on how long to learn Mandarin it takes.