UC Berkeley Data 8 (Foundations of Data Science)
Introductory data science/analytics course using Python; includes lectures, labs, and exercises for free online.
RAND ? Wargaming
Overview of RAND?s analytic wargaming practice, including tabletop, seminar, and computer-supported games used for research and decision support.
LeetCode SQL Problems
Collection of SQL coding challenges to practice writing queries, often used in interview preparation.
StatQuest with Josh Starmer (YouTube)
Clear and approachable explanations of statistics and data analysis, breaking down complex concepts into simple steps.
GeeksforGeeks Python Programming
Extensive collection of Python tutorials, code snippets, and explanations for basic to advanced topics, including algorithms.
GregMat (YouTube)
Popular YouTube channel with hundreds of free GRE quant and verbal walkthroughs, strategies, and practice problem explanations.
SQLite Tutorial
Focused tutorials on SQLite, covering SQL basics, database management, and practical coding examples.
R-Bloggers
Aggregator of hundreds of blogs covering R tutorials, packages, and real-world data science applications.
Marine Corps Warfighting Lab ? Wargaming Division
USMC wargaming division supporting concept development and force design through iterative gaming and analysis.
Real Python (Free Articles)
In-depth tutorials, explanations, and code examples for beginners to advanced Python developers, with a mix of free and premium content.
Project Euler
Hundreds of challenging computational math problems that build problem-solving and programming skills.
MOOC.fi - Introduction to Data Analysis with Python
Free course from University of Helsinki teaching data analysis workflows with Python and Pandas.
Manhattan Prep GRE Resources
Free GRE study materials, strategy guides, and practice question sets.
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.
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.
UK Fight Club (Professional Wargaming Network)
Community that promotes professional military wargaming and simulation activities across UK defense.
HackerRank SQL Domain
SQL challenges of varying difficulty levels with instant online feedback, great for structured practice.
CrunchPrep GRE Blog
Guides and strategies for GRE preparation including word lists, essay templates, and quantitative shortcuts.
IBM Data Analyst Professional Certificate (Audit Free)
Covers data analysis with Excel, SQL, Python, and data visualization tools, including projects and case studies; free in audit mode.
Ready4GRE Vocabulary App
Free app with flashcards, quizzes, and personalized study plans for GRE vocabulary practice.