YSK: It is common advice to make your password full of random characters, numbers, and symbols. However, a sentence with at least 10 words can be much more secure and will be significantly easier to remember.
from /r/YouShouldKnow
YSK: 通常的建議是讓你的密碼充滿隨機字符、數字和符號。然而，至少有10個字的句子可以更安全，而且會明顯更容易記住。