Google Codelabs
Google Codelabs contains many excellent and small real world programming examples and instructions, pretty good resources for improving pratical skills:
GitHub Cards
Good GitHub cards to easily display your repos and personal profile: lepture/github-cards
Computer Science Courses
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Udacity: Introduction to Computer Science
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CS61A: The Structrue and Interpretation of Computer Programs(SICP)
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CS61B: Data Science
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Coursera: Princeton Algorithms(Sedgewick)
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CMU152B: Computer Systems--A Programmers's Perspective(CSAPP)