🖥️ Computer Science Coding
Scratch (MIT) Block-based coding for beginners (elementary & middle school).
Code.org – Structured coding lessons for K–12 (includes AP CSP prep).
CS First (Google) – Free, project-based coding curriculum.
​Khan Academy Computer Science – Coding, algorithms, and computer science concepts.
USACO Guide – Competitive programming (advanced, middle/high school).
Project Euler – Math-based coding challenges (advanced).
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🔬 Science
PhET Simulations (University of Colorado) – Interactive science and math simulations.
NASA STEM Engagement – Space and science activities for K–12.
HHMI Biointeractive – Free biology animations, videos, and labs.
Science Buddies – Science fair projects and experiments.
Crash Course YouTube – Engaging video lessons on biology, physics, chemistry, etc.

🔢 Math
Art of Problem Solving (AoPS) – Advanced math curriculum and problem-solving community. Brilliant.org – Interactive math and logic lessons.
NRICH (Cambridge) – Math problems, puzzles, and enrichment activities.
Khan Academy Math – Full K–12 math curriculum.
Desmos – Graphing calculator + math activities.

​🛠️ Making / Engineering / Creativity
Instructables – Step-by-step DIY projects.
Maker Camp (MakerEd) – Hands-on maker activities for kids.
Tinkercad – Beginner-friendly 3D design, coding, and electronics.
MIT OpenCourseWare – Hands-on STEM – Advanced STEM labs (for high schoolers).
LEGO Education – Robotics and building challenges.

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