Want to practice to improve your skills?
Here are some of my favorite resources:
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SQL, Python, Java, Ruby:
- HackerRank, practice challenges ranging from beginner to hard
- Discussion pages have tons of useful examples and different solutions
- HackerRank, practice challenges ranging from beginner to hard
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R:
- ListenData, Refresher on basic R commands and data manipulation
- Analytics Vidhya, 40 questions to test your skill on R for Data Science
Want to learn new skills?
Check out these great tutorials & courses:
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SQL:
- Khan Academy, Free beginner SQL course
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Python:
- edX, Free beginner computer science using python, by MIT
- Python Data Analysis, LinkedIn Learn course
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R:
- Udemy, Free beginner R course
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Computer Science:
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- edX, Free beginner computer science course providing some familiarity with several programming languages, by Harvard