好记性不如烂笔头 (hǎo jì xìng bù rú làn bǐ tóu)

好记性不如烂笔头

(hǎo jì xìng bù rú làn bǐ tóu)
English Translation:“A good memory is not as good as bad writing.”

Meaning:
The best way to remember something is to write it down. This emphasizes the value of writing over relying on memory alone.

Example:
我总是忘记一些事情，好记性不如烂笔头，我决定开始做笔记。
(I often forget things; “a good memory is not as good as bad writing,” so I’ve decided to start taking notes.)

Source: Hello Mandarin