Book6First-Course-in-Data-Science corresponds to the sixth volume of the series "Data Science with Principles," known in Chinese as "The Iris Book: From Basic Arithmetic to Machine Learning." This repository serves as a companion resource for learners transitioning from foundational mathematical concepts to practical machine learning applications. It emphasizes a clear, simplified approach to statistics and data science principles, aiming to demystify complex topics for students and practitioners. The project highlights an open-source philosophy, offering permanent access to its learning materials without expiration. It encourages active community participation by inviting users to identify and report errors in the content. Contributors who provide significant corrections or suggestions are rewarded with complimentary copies of the related physical books, fostering a collaborative environment for improving educational quality. The material complements other works in the series, including "Statistics Simplifie