Computer Science

provides tons of training tutorials, reference docs, exercises, and certifications on all mainstream programming languages for all levels of learners. Learners can direct code on their online environment (no pre-installation required).

offers free (and paid) courses and projects for all levels of learners. Learners can direct code on their online environment. Also provides simple Docs to explain programming concepts, e.g. Python concepts.

learn how to use GitHub - the largest platform for developers and companies to host and maintain their open-source projects.

offers video tutorials and quizzes to learn coding and earn certificates.

provides free online courses from top universities and leading companies around the world. Learners can get certification with a fee.

provides free and paid online courses from top universities and leading companies around the world. Also provides certification with a fee.

provides coding tutorials, real-world projects and paid competitions. Also offers a large pool of datasets for learners to practice.

provides questions and contests to improve coding skills and prepare for technical interviews.

a very active community for learners to ask questions and share coding solutions. Simply search the error message + "stack overflow" to find possible solutions.

one of the most popular blogging platforms for people to share ideas and stories. Many programmers/ software developers/ data scientists write about how they solve specific problems and share good practices (with full codes). See some posts on Computer Science, Coding, Python.