Project Euler
Hundreds of challenging computational math problems that build problem-solving and programming skills.
PostgreSQL Tutorial
Free tutorials covering PostgreSQL features, SQL basics, stored procedures, and advanced database functions.
UK Fight Club (Professional Wargaming Network)
Community that promotes professional military wargaming and simulation activities across UK defense.
GeeksforGeeks Python Programming
Extensive collection of Python tutorials, code snippets, and explanations for basic to advanced topics, including algorithms.
OpenIntro Statistics
Free, open-source statistics textbook with R labs and applied data analysis examples.
StatQuest with Josh Starmer (YouTube)
Clear and approachable explanations of statistics and data analysis, breaking down complex concepts into simple steps.
Tableau Public Resources
Free resources and tutorials for using Tableau to create interactive visualizations and dashboards.
Swirl: Learn R in R
An interactive R package that teaches R programming and data science concepts directly inside the R console.
EDX ? Analyzing and Visualizing Data with Power BI (Audit Free)
University of Illinois & Microsoft course teaching Power BI for analytics and reporting, free in audit mode.
Art of Problem Solving (AoPS) Online Resources
Challenging problems, explanations, and articles designed for advanced high school and college-level students interested in problem solving and Olympiad-style math.
Saylor Academy - Mathematics
Free, full-length math courses (Linear Algebra, Abstract Algebra, Real Analysis, etc.) with exams and certificates.
FreeCodeCamp - Data Analysis with Python
Full curriculum teaching Python for data analysis, including Pandas, NumPy, data cleaning, and visualization, with projects.
Springboard Data Analytics Curriculum (Free Prep)
Introductory lessons and exercises to build foundation skills in Excel, SQL, and data storytelling.
Guy in a Cube (YouTube)
Popular YouTube channel run by Microsoft employees, offering weekly tutorials, best practices, and troubleshooting tips for Power BI.
DataCamp Free Courses
Free beginner-friendly courses in data analysis with Python, R, and SQL; includes guided projects.
The Carpentries - Data Carpentry
Community-driven lessons for researchers covering data organization, cleaning, visualization, and analysis in R, Python, and SQL.
Analytics Vidhya
Wide range of free tutorials, guides, and case studies on data analytics, machine learning, and business intelligence.
Kaggle Learn R
Hands-on mini-courses for R programming, data visualization, and machine learning with interactive notebooks in the browser.
PyBites Platform (Free Exercises)
Short, practical coding exercises (some free) focused on solving real-world problems in Python.
Coursera - R Programming (Audit Free)
Johns Hopkins University?s R Programming course (part of the Data Science Specialization), free in audit mode with videos and quizzes.