Scratch is a great community, where it's easy to explore others' creations, and share. The language is block-based. The output is graphical. And you can run a

Scratch is a great community, where it's easy to explore others' creations, and share. The language is block-based. The output is graphical. And you can run anyone's program, and then view the source to see how they did it. Not many data structures, iirc.