Self Help
Social media is filled with self help gurus. But their purpose is not to make you better. But to justify to you when you are wasting time on social media instead of working on your dreams. If you really want to work on self improvement then you have to read works which have remained popular despite passage of time or lessons from people who have achieved real success. If you want to learn about happiness then nothing is better than Buddha's teachings. If you want to learn about work then Bhagwada Gita is the best book.