This site has many simulations helpful in understanding various computer science topics taught in high school.
The index has a list of all the topics taught on this site.
Some favorites:
When we started Codecademy, our goal was to give anyone in the world the ability to learn the skills they’d need to succeed in the 21st century. We set out to create a new, interactive way of learning — making it engaging, flexible, and accessible for as many people as possible. Since then, we have helped millions of people worldwide unlock modern technical skills and reach their full potential through code.
We want to create a world where anyone can build something meaningful with technology, and everyone has the learning tools, resources, and opportunities to do so. Code contains a world of possibilities — all that’s required is the curiosity and drive to learn. At Codecademy, we are committed to empowering all people, regardless of where they are in their coding journeys, to continue to learn, grow, and make an impact on the world around them.
Explore 25+ programming playgrounds with tutorials on-the-go.
Learning to code is hard! Upfront investment in equipment is high. Setting up coding environment is cumbersome. Foundations are incredibly important yet there's no clear strategy to acquire them. No one has time to read books and watch videos.
Yolmo's playgrounds are a comprehensive self-guided learning environment. We are a team of software engineers, teaching experts and computer science educators who have come together to make it easy for anyone to learn how to code.
Supported Languages: Javascript, Go, C, Python, Rust, Turtle, Java, Lisp, SQL, Cobol, Perl, Lua, Graphviz, Picat, C#, HTML, PHP, Ruby, Typescript, Markdown, Dart, Solidity, Deno
Treehouse is a self-paced learning site for web design, coding, business, and more. Its developers are constantly adding more material but always include beginner, intermediate, and expert help. With over a dozen tracks for learning, each takes from a few hours to a few dozen hours to complete.
Our goal is to provide high-quality, low-cost technical instruction to anyone having an interest in coding and design. All are welcome!