They have a lot of content for each grade level and are quite engaging, especially for the lower grades.

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They have few different courses available (HTML/CSS, Javascript, Python, etc.) with video lessons and reference guides to use as resources throughout. The lessons are broken down into manageable modules. It's quick and easy to learn the basics, and the interface allows you to track your progress, motivating you to push through the course even if you only have smaller chunks of time available. They break down the concepts well and each lesson builds well upon previous ones. They also have lessons dedicated to fixing code and finding bugs which was a useful skill to work on.