1. "You can't have your cake and eat it too."
This maxim means that you can't have both things that you want. You have to choose one or the other.
2. "A bird in the hand is better than two in the bush.."
This maxim means that you should take advantage of what you have in hand, rather than chase after something else.
3. "Don't put all of your eggs in one basket."
Don't concentrate all your resources in one place. Spread them out so that you don't lose everything if something happens to one of them.
4. "The early bird gets the worm."
This maxim means that if you want something, you have to take action early on. Don't wait until it's too late.
5. "Two wrongs don't make a right."
This maxim means that retaliating against someone who has wronged you will not make things better. It will only make things worse.