from which libraries should I start from ?
If you’re already familiar with Python, this is a great place to start:
https://www.freecodecamp.org/learn/data-analysis-with-python/
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As pkdvalis already said, the DA course on freeCodeCamp is a good entry point to be familiar with 2 fundamental python libraries for data analysis: NumPy and Pandas.
After that I would suggest you to deeper learn visualization libraries:
- matplotlib for layout of your plots
- seaborn as the best statistical visualization library
- plotly for interactive plots including geospatial plots
Next step can be go deeper to statistics and predictive analysis. Here you need to get acquinted with:
- ScyPy (statistics estimators and hypothesis testing)
- Scikit-learn (basic machine learning models)