How to understand the concept of karma in Buddhism?

Karma can be understood as several conditions that constitute an act, which is an important theory of "cause and effect" in Buddhism. In terms of development, it is called karma, focusing on results, focusing on conditions and focusing on the whole process. For example, we often say that "planting a millet in spring and harvesting 10,000 seeds in autumn" includes all this. "Millet" is the cause, "seed" is the fruit, and "Spring and Autumn" is the season. If a seed wants to germinate, it must first be sown on suitable soil, and it must also have many factors or conditions such as nutrition, moisture, sunlight, temperature and so on before it can germinate. Buddhism believes that "everything has a cause", which means that "anything or behavior can only be formed if conditions are met", so the most typical Buddhist scripture is "everything has a cause, and there is a cause in this life; There is no reason for this, and there is no reason. "