The assignment content discusses John Stuart Mill's concept of 'experiments of living', which refers to the various decisions and experiences that shape an individual's life. According to Mill, these experiments are essential for human development as they allow individuals to form their own opinions, make choices based on their own moral preferences, and develop their unique personalities. The content also highlights the importance of originality, modesty, and the recognition of humanity's imperfections in accepting different forms of living. Additionally, it touches upon Mill's views on customs, character, and the role of religion in shaping individual decisions.