Meaning: Peace is the only way to create a better world for everyone.
Choice of Words: Only means the one and only. Way means a method or manner of doing something.
Alternative Expressions
War is not the answer.
Meaning: This sentence means that war is not the way to solve problems. It will only lead to more violence and destruction.
Choice of Words: "War" means a state of armed conflict between countries or groups. "Is not" means that something is not true or correct. "The answer" means a solution to a problem.
Love is the key to happiness.
Meaning: This sentence means that love is the most important thing in life. It is the key to finding happiness and fulfillment.
Choice of Words: "Love" is a feeling of deep affection and care for someone. "Is" is a verb that means to exist or to be something. "The key" means something that is essential or necessary for something else to work. "Happiness" is a state of well-being and contentment.