Harvard University has a great selection of free, self-paced online courses. These courses are perfect for anyone looking to learn more about computer science, programming, cybersecurity, and data science.

You can find these courses on Harvard’s Professional and Lifelong Learning website at pll.harvard.edu. Here are some highlights:
Introduction to Computer Science
Duration: 11 Weeks
This course is your starting point in computer science. You’ll dive into algorithms, data structures, and software engineering. It’s hands-on, letting you work with languages like C, Python, SQL, JavaScript, HTML, and CSS. By the end, you’ll complete a project that showcases what you’ve learned, all while connecting with other students from around the world.
Introduction to Programming with Scratch
Duration: 3 Weeks
If you’re new to programming, this course is a fun way to start. Using Scratch, a visual programming language, you’ll create animations and games. You’ll learn essential programming concepts like functions and loops. It’s a great way to build a foundation before tackling more traditional languages like Python and Java.
Introduction to Cybersecurity
Duration: 5 Weeks
This course covers the basics of cybersecurity, making it suitable for everyone. You’ll learn how to protect data and devices, all while understanding the balance between risks, costs, and usability. The course includes real-world examples and assignments to help you apply what you learn.
Harvard offers over 100 free courses in areas like artificial intelligence, machine learning, and data science. These resources present endless opportunities to help you grow your skills and advance your career.
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