You might remember the meaning of the character 勉 with this easy mnemonic:
I exhort my students to study by giving them magnets (⺈) or chocolates in their mouths (口) when they do well. When they do bad, they'll get sore legs (儿) from power (力) walking as punishment.
Using mnemonics to remember the meaning of Chinese characters like has a huge impact on how long to learn Mandarin it takes.