You might remember the meaning of the character 恼 with this easy mnemonic:
My brother got mad at me because I broke his jack-o-lantern (忄). In my defense, the lid (亠) was already open like a box (凵), I just slashed (丿) it in half, that's all!
Using mnemonics to remember the meaning of Chinese characters like has a huge impact on how long to learn Mandarin it takes.