CS50x 2026 Lectures

Course Description: CS50x 2026 Lectures

CS50x 2026 is Harvard University's renowned introductory course to the intellectual enterprises of computer science and the art of programming, designed for both majors and non-majors. Led by Professor David Malan, this course aims to equip students with the foundational skills necessary to think methodically, communicate precisely, and solve problems efficiently through coding. Whether you're new to technology or already comfortable with it, CS50x offers a welcoming and supportive environment to explore the world of computer science. The course is freely accessible via platforms such as edX, YouTube, Apple TV, Google TV, and CS50's own website, making it available to learners worldwide. By the end of the course, students will have developed the ability to design and implement their own final project, showcasing their newfound programming skills to the world.

The course begins with Scratch, a user-friendly graphical programming language that introduces students to coding concepts by allowing them to drag and drop puzzle-like pieces that only fit together logically. As students progress, they transition to C, a traditional keyboard-based language that provides insight into how computers operate "under the hood." The curriculum then moves on to Python, a versatile modern language used for data analysis, automation, and web application development, and SQL, which enables students to manage and query large datasets in databases. Toward the end of the course, students delve into web development using HTML, CSS, and JavaScript, gaining the skills to create both web and mobile applications. Throughout the course, students are supported by a vibrant community and innovative tools, such as a virtual "rubber duck" powered by AI, to help troubleshoot and debug their code.

In addition to technical skills, CS50x emphasizes problem-solving and critical thinking by exploring real-world applications of programming. For example, students analyze reading levels of texts using mathematical functions, break down strings to understand how computers process text, and explore cryptography to secure communications. Debugging is another key focus, with lessons on identifying and resolving bugs inspired by historical anecdotes, such as Grace Hopper's discovery of an actual moth causing a system error. By combining theoretical knowledge with hands-on practice, CS50x empowers students to tackle diverse challenges, from simple algorithms to complex software development. This comprehensive approach ensures that students not only learn how to program but also gain the confidence and creativity to innovate in any field they choose.