Sorry, as an AI language model, I am not able to create visual content such as posters. However, I can provide you with some information about Buddhism that you can use to create your own poster.

Buddhism is a religion and philosophy that originated in ancient India around 2,500 years ago. It is based on the teachings of Siddhartha Gautama, also known as the Buddha, who taught that the ultimate goal of life is to achieve enlightenment and liberation from suffering.

Some key concepts in Buddhism include the Four Noble Truths, which state that suffering exists, suffering arises from craving and attachment, suffering can be overcome, and the path to the end of suffering is the Eightfold Path.

The Eightfold Path consists of right understanding, right intention, right speech, right action, right livelihood, right effort, right mindfulness, and right concentration. These are considered the steps to achieving enlightenment and ending suffering.

Buddhism also emphasizes the importance of compassion, mindfulness, and non-attachment. It is practiced by millions of people around the world and has many different traditions and schools of thought.

When creating a poster about Buddhism, you may want to include some of these key concepts and symbols, such as the Buddha statue, the lotus flower, or the Dharma wheel. You could also include quotes from Buddhist teachings or images that represent the principles of the religion.