Recommendation for Coursera or Udemy courses?

Data Science undergrad here, just finished off my first year, and I'm looking to just improve technical skills. For programming, I primarily do Python, nothing too complex just yet, just cleaning, some simple clustering, and regressions. I do of course take maths classes and CS (Java) as minors.

However, I'm primarily looking for courses, I can take to just put me ahead of the curve. Especially for when I apply to internships later this year (for next year) and to …

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