In some cultures, firewood is regarded as a symbol of wealth and warmth. For example, in the traditional culture of China, firewood is regarded as an important part of family life, because it is a necessity for cooking and heating food and water. Therefore, piling firewood in the yard may be regarded as an arrangement that symbolizes wealth and family warmth.
But if you are confused or uncertain, you'd better seek professional feng shui advice to better understand how to optimize your courtyard and indoor layout, thus increasing your wealth and happiness.