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: 通常的建议是让你的密码充满随机字符、数字和符号。然而，至少有10个字的句子可以更安全，而且会明显更容易记住。