About Courses Availibility

When will be the courses for Sass, React, and D3 will be available?
Do I need to learn Data Visualization before learning Back End?

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There might still be bugs, but you can go through them on beta.freecodecamp.org

No, you don’t really need to know data visualization for the back end. So if you want to do the back end first, that is fine.

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Thanks for the help!