我正在尝试学习 Holt Winters 指数平滑。在算法中，预测时涉及三个指标（水平、趋势、季节性）。

我的问题：

What is the interpretation of these 3 indices?
How do I differentiate between different values of these indices? For example, what is the difference between level 100 and level 200 or what is the difference between trend 2 and trend 5?
How do we initiate these values?

任何帮助将不胜感激。