Many aspects of computer science are fundamental to data science. A good data scientist has to be able to transform/extract/manipulate lots of data. Computer programming is the main technique for such operations. Here are numerous resources to help you learn the fundamentals of computer science.

Online Computer Science Courses: Introductory Level

If you are not familiar with computer programming, this list is a good place to start.

Online Computer Science Courses: More Advanced

Two More Helpful Resources

Stack Overflow is a great site for answering all of your programming questions. It is good for beginners as well as more advanced programmers. Also, if you start writing a lot of code, Github is a great place to store that code.