piece of advice
word of advice

"Do you think your friend in the city would like a piece of advice?"

This Section is not really so much a law as a piece of advice.

Therefore I don't think one piece of general advice is a good thing.

I just want to offer you one good piece of advice.

This is probably the most important piece of advice I can give you.

What's the best piece of advice for anyone looking to make it to director level?

What's the best piece of advice you've ever been given?

May I first give you a short piece of advice.

The most important piece of advice: Don't try to do everything in a day!

And if I may give you a last piece of advice, don't get to bed too late.