act on sb's advice 照某人的忠告行事
give sb a piece [a bit, a word] of advice 向某人提出忠告[劝告]
take sb's advice 听从某人的忠告
Advice when most needed is least heeded. 【谚】 越重要的忠言越没人听
Nothing is given as freely as advice. 【谚】 人最能慷慨给予的是忠告.

seek [take] medical advice 请医生诊察.

letter of advice
a remittance advice 汇款通知
shipping advices 发货通知
an advice slip 通知单
as per advice 按通知行事.