You might remember the meaning of the character 脚 with this easy mnemonic:
Legend has it that the moon (月) used to have earth (土) on it, and the gods used to kick footballs around on it. Then a certain god decided that it should be a private (厶) land and made everyone sign with their personal seals (卩) that they would never step foot on the moon again.
Using mnemonics to remember the meaning of Chinese characters like has a huge impact on how long to learn Mandarin it takes.