Tilly, if you are interested in philosophy now, I suggest you start with two enlightenment textbooks, Sophie's World and Russell's History of Western Philosophy, and then you can study some early philosophical works of human beings, such as The Republic and Laozi (the language is relatively simple), and then you can dabble in academic philosophy such as Whitehead, Hegel and Kant. But the most important thing is to learn math well. Mathematics in senior high school is something that any ordinary student can learn well. If you can't even pass this level, it will be difficult to learn anything in the future, because the role of mathematics in cultivating individual learning ability is incomparable to other disciplines. In addition, recommending Zhang's Origin of Mathematics can increase the perceptual knowledge of real mathematics. The most classic book to judge various philosophical schools without colored glasses is Tilly's History of Western Philosophy. This book is recognized as one of the most rigorous and objective works on the history of philosophy, which introduces everyone in the history of philosophy in a very detailed and fair way. This book is indeed often recommended as a book suitable for beginners of philosophy. In addition, Stumpp's history of western philosophy is also worth considering. If I want easy-to-understand original philosophical works, I can only think of a few, such as Descartes' Talking about Methods, Reflection on the First Philosophy, Locke's Theory of Human Understanding and so on. Everything else is hard to understand.