CS50x

This is CS50x, Harvard University's introduction to the intellectual enterprises of computer science and the art of programming for majors and non-majors alike, with or without prior programming experience. An entry-level course taught by David J. Malan, CS50x teaches students how to think algorithmically and solve problems efficiently. Maintained by yasingunay on GitHub, where it has earned 37 stars from the community.

It's actively developed around algorithms, c, css, and is a solid reference for anyone building with these tools.