1, basic stage:

History of Western Philosophy, Sophie's World, History of China's Philosophy, Philosophical Notes, etc.

2. Promotion stage:

Kant's three major criticisms, the original works of Hegel, Feuerbach, Marx, Heidegger, Nietzsche and others. Specific Baidu search.

3. Easy reading after class:

A cultural book introducing various ideas. Chrysanthemums and knives about Japanese culture and so on.