Codecademy.com is better. Scratch on the Raspberry Pi is too easy and it's retarded for older people. It's aimed at under 7 at a max of 8. Code.org is okay. You can't beat actual books that teach you though. I'm fluent in Python and Ruby. And I know a little of Java, HTML, Javascript, and a few other languages. Anyone wanting to code disregard this, Because Scratch while being okay is not amazing. I did use it a little though.
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If you want to code, use ScratchJr if you are under 7. Use Scratch.mit.edu if you are older. It helps you code real well. Check me out on Scratch. My user is hkp08. Also try Code.org.