You might remember the meaning of the character 情 with this easy mnemonic:
At a lantern (忄) festival, a girl feeling blue (青) wrote her secret affection towards her crush on a lantern. She set off the lantern into the sky like many others and watched it fly away in the night sky.
Using mnemonics to remember the meaning of Chinese characters like has a huge impact on how long to learn Mandarin it takes.