This course is designed to assist students in exploring the realm of Second Language Acquisition (SLA). Firstly, this comprehensive course will lead the student to delve into the fundamental principles that govern the acquisition of new languages. Subsequently, students will be led into the discussion of the role of other languages in the acquisition process as well as the multifaceted factors that carry influences. Moreover, the course also explores the application of this applied linguistics in teaching or pedagogical practices and research endeavors. Throughout the course, regular comprehensive assessment is provided to guide students in measuring their improvement in the learning process and final examination is attached at the end of the course to let the students see the comprehensive overview of their SLA learning journey. This course provides a profound understanding of language acquisition and learning processes and is valuable for not only students, but also educators, language enthusiasts, and anyone intrigued by the intricacies of acquiring a second language.