You might remember the meaning of the character 嫂 with this easy mnemonic:
My sister-in-law is a strong woman (女) who wanted to build a brick and mortar (臼) store for her clothing line (丨) and never gave up, despite having failed again (又) and again.
Using mnemonics to remember the meaning of Chinese characters like has a huge impact on how long to learn Mandarin it takes.