An introduction to programming using Python, a popular language for general-purpose programming, data science, web programming, and more.
For anybody that might not have heard, Harvard University launched Intro to Programming with Python last year, which is a free 9-week course for complete beginners and includes a free certificate of completion at the end.
It's taught by the same professor who teaches Harvard's Intro to CS, the university's most-popular on-campus course.
The course is very hands-on with weekly problem sets and a final project that you complete through an in-browser code editor.
You can also take the course via edX but there, the certificate costs $199. If you take it through Harvard OpenCourseWare, the course is exactly the same but the certificate is entirely free.
I completed the CS50x course and it was very good!, although I believe its too difficult for 100% beginners. I do recommend people to check it out though!
CS50 courses are legit, I learnt a lot from taking CS50 as a teenager even if I didn't manage to complete it back then, should get around to finishing it sometime.