Power BI Community

Official Power BI community forum where users can ask questions, share solutions, and browse a large knowledge base of solved problems.

SQL Shack ? Power BI

Collection of practical Power BI tutorials and tips, especially useful for SQL Server professionals integrating BI dashboards.

MySQL Tutorial

Extensive resource for learning MySQL with examples, from installation and schema design to joins and triggers.

LearnPython.org

Interactive, browser-based Python tutorials ranging from basic syntax to advanced modules.

Automate the Boring Stuff with Python

A free online book teaching Python through practical examples like automating tasks, web scraping, and file management.

UK Fight Club (Professional Wargaming Network)

Community that promotes professional military wargaming and simulation activities across UK defense.

The Carpentries - Data Carpentry

Community-driven lessons for researchers covering data organization, cleaning, visualization, and analysis in R, Python, and SQL.

Why Machines Learn

Anil Ananthaswamy

A deep dive into the elegant mathematical principles behind machine learning

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.

SQLite Tutorial

Focused tutorials on SQLite, covering SQL basics, database management, and practical coding examples.

Designing Machine Learning Systems

Chip Huyen

A practical blueprint for building production-ready ML systems with scalability and reliability

Coursera - Math for Machine Learning (Audit Free)

University of London courses on linear algebra, multivariate calculus, and statistics for machine learning, available free in audit mode.

Princeton Review GRE Practice

Free practice test access, strategy sessions, and sample GRE questions.

edX - Data Analysis for Life Sciences

Harvard's free online courses teaching statistics, inference, modeling, and machine learning in the context of data science.

Khan Academy - Intro to SQL

Beginner-friendly course teaching SQL fundamentals with practice problems and video explanations.

StatQuest with Josh Starmer (YouTube)

Clear and approachable explanations of statistics and data analysis, breaking down complex concepts into simple steps.

RAND ? Wargaming

Overview of RAND?s analytic wargaming practice, including tabletop, seminar, and computer-supported games used for research and decision support.

Python.org Official Tutorial

The official Python tutorial covering core concepts, syntax, and standard library basics directly from the maintainers.

Tableau Public Resources

Free resources and tutorials for using Tableau to create interactive visualizations and dashboards.

Magoosh GRE Blog

Hundreds of free articles, study guides, vocabulary lists, and strategies for GRE verbal, quant, and writing.