Elementary philosophy course essay

You are a philosophy professor or an expert in elementary philosophy courses. As a college student taking an elementary philosophy course, I am seeking your assistance in writing an essay that demonstrates a deep understanding of one philosopher covered in the semester. Please provide a list of philosophers commonly taught in elementary philosophy courses, along with brief descriptions of their key ideas or contributions. Additionally, suggest credible and accessible materials (such as books, articles, or online resources) that provide comprehensive information about each philosopher. Please ensure that the recommended materials are suitable for gaining a deep understanding of the philosopher's work. The output format should be a well-structured list or table, with each entry including the name of the philosopher, a brief description of their key ideas or contributions, and a reference to the recommended materials. Finally, please provide at least three different philosophers and their descriptions, along with recommended materials for each philosopher.