Quote Originally Posted by pumpernickel View Post
Invest what you can afford to lose, meaning invest anything that you see go to $0 overnight that won't change your daily life.
Well said. I believe the Oracle of Omaha said something similar. He has 2 rules of investing:

Rule 1- Never lose money.

Rule 2- Never forget Rule 1.

In other words, be in it for the long-term and stick with proven winners.