I think that KhanAcademy offers a lot of great material on the basics of computer science, maths, and many more topics. It is also entirely and has a great user

I think that KhanAcademy offers a lot of great material on the basics of computer science, maths, and many more topics. It is also entirely and has a great user experience. (https://www.khanacademy.org/computing https://www.khanacademy.org/computing) If you are searching for more advanced computer science topics, FreeCodeCamp and the FreeCodeCamp news platform might be for you (FreeCodeCamp offers programming content while the news platform has articles on a wide variety of topics, including computer science, productivity, math, etc.). (https://www.freecodecamp.org/news/ https://www.freecodecamp.org/news/) Both follow a project and exercises based learning approach that first shows you the basics of the concept and then sends you out to build something and solve problems using the newly discovered skill.