This PDF is a comprehensive compilation of my personal notes from the 1st semester of my 1st year in BS Information Systems. It is tailored specifically for first-year students who have no prior knowledge of programming. The notes cover essential concepts and topics, including Variables, Data Types, Sequential Structures, Selection Structures, Looping Structures, and Functions. Designed to introduce and reinforce the fundamentals, this compilation is perfect for those beginning their journey in programming and aiming to build a strong foundation in C language.