When are hard light, soft light and natural light suitable for use?

Hard light is generally used to express people or scenery with strong and tenacious style; Soft light presents a warm and dreamlike scene, which is common in women and children's photography; Natural light is widely used. Common scenery, tourism, news, documentary and other photography are mainly natural light. The front hard light and soft light are generally realized by auxiliary light or auxiliary equipment and post-processing.