You can learn either one as both of them are quite powerful and popular. One factor you can use to decide is if you are more comfortable with python or JavaScript. If it's Python then you should learn Django and if it's JavaScript then you can learn NodeJS. If you are not comfortable with either one then you can try them both and learn one of these.
If you wish to learn more about Django you can take this end to end Django certification course.
If you just wish to get your feet wet and try Django out you can follow this Django tutorial.
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