My first boss gave me a bit of good advice that I have tried to put into action ever since. This is it:

Always stay on the right side of the secretaries.

I have received much helpful advice in my life, but there is one piece of advice that I received from my father and his advice was very smart.

He said, "Watch the pennies (our smallest coin value) and the dollars will take care of themselves".

This expression/proverb/adage means that if we are careful with small amounts of money, then we will probably handle large amounts of money well.

In other words, it means "money does not grow on trees", "be careful with your money", and "don't waste money".

Being careful with our money becomes very important when we are older and stop working and then must live on the money we have saved. In this way, we will never be a burden on anyone else.

Good question Sarah

The most valuable advice in my life gave me my father.

THE MOST VALUABLE ADVICE I HAVE RECEIVED IN ALL MY LIFE CAME FROM MY FATHER.
MY FATHER GAVE ME THE MOST VALUABLE ADVICE IN ALL MY LIFE.

He said to me, never be afraid of work.

HE TOLD ME TO NEVER BE AFRAID OF WORKING HARD

And if you started something to do, then make it perfect. 

AND IF YOU START SOMETHING, BE SURE TO DO IT WELL/ TRY TO DO IT PERFECTLY.

What advice in your life DO you cherish most of all?