Code.org

Code.org provides free, standards-aligned computer science curriculum designed for schools and self-learners across all ages. The platform progresses from visual block-based coding for younger students to full programming languages and algorithms, offering a structured pathway rather than scattered lessons.

It's the go-to for educators introducing computer science to K-12 students and for adults starting from zero. The sequenced progression and free resources make it more accessible than many coding bootcamps, though it focuses on foundational breadth rather than job-market specialization.