freeCodeCamp's free certification in data analysis with Python, NumPy, pandas, Matplotlib and Seaborn, earned through projects.
Learn to read data from sources such as CSV files and SQL, and to clean, analyse and visualise it with the core Python data libraries. The certification is earned by completing hands-on projects.
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This course is run by freeCodeCamp. glitchdata describes it and links to it, but doesn't host its lessons — you take it on their site, under their terms.
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Google's entry-level data analytics programme: spreadsheets, SQL, Tableau and R, with a portfolio case study.
A beginner-friendly course on querying data with SQL: filtering, sorting, joins, subqueries and data preparation.
Harvard's series on data science with R: basics, visualisation, probability, inference, wrangling, machine learning and a capstone.