Good advice is good advice. 

When [Maker Studios co-founder Shay Carl] wanted to lose weight and get in shape, he didn’t focus on the latest diet book, or look for cutting-edge secrets. He realized all he needed to do was stop ignoring the clichés and actually listen to them. “Eat less and exercise more” is about as trite as they come. It also works.

This applies to many areas in life. “Spend less than you earn” is basic budgeting. “Don’t go to bed angry” is a valid technique for dealing with relationship problems. Clichés may not be the only advice you ever need, but don’t think of them as wrong just because they’re common. Think of them as starting points.