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CodeCademy is a free, online, code instruction site. Not for the graphically driven among us, CoedCademy is crunchy and serious. If you wish to learn HTML, Python, or most of the popular coding languages out there, consider CodeCademy as an excellent resource. The user sees two windows, one with the code and one with the results of the code as an end user would see it, so feedback is instant. Badges are earned as you work your way through the courses. I like it!