Udemy

Udemy is a global learning platform offering self-paced courses in analytics, statistics, and decision modeling?ideal for those pursuing or preparing for a U.S. Army ORSA role.

R for Data Science (Hadley Wickham & Garrett Grolemund)

A free online book teaching R through the tidyverse approach, covering data wrangling, visualization, and modeling.

Coursera

Offers beginner-friendly courses from top institutions like IBM and Duke. You can audit many courses for free, including topics like Excel, SQL, Python, and data visualization.

Why Machines Learn

Anil Ananthaswamy

A deep dive into the elegant mathematical principles behind machine learning

DataCamp (Free R Tutorials)

While DataCamp is subscription-based, it offers free introductory R courses covering basics, data manipulation, and visualization.

UC Berkeley Data 8 (Foundations of Data Science)

Introductory data science/analytics course using Python; includes lectures, labs, and exercises for free online.

OpenLearn - Learn to Code for Data Analysis

Free Open University course introducing Python programming in the context of data analysis.

Math StackExchange

A global community where advanced math students and professionals ask and answer detailed mathematics questions, from abstract algebra to applied math.

HackerRank SQL Domain

SQL challenges of varying difficulty levels with instant online feedback, great for structured practice.

Build a Large Language Model from Scratch

Charanpal Dhanjal

A hands-on guide to constructing your own LLM using modern machine learning techniques

Magoosh GRE Blog

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

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.

Quick-R (StatMethods)

Practical R tutorials focused on statistics, graphics, and data analysis, written in a straightforward, example-driven style.

CNA ? Gaming & Integration Program

Designs, facilitates, and analyzes sponsor-focused wargames for DoD and government decision-makers.

Enterprise DNA Blog

Tutorials and case studies focused on practical Power BI usage, advanced DAX, and visualization techniques.

Kaggle Learn - Data Analysis

Hands-on mini-courses for Python, R, SQL, and visualization with Jupyter notebooks that run directly in the browser.

Marine Corps University Press ? Wargaming Topic

Curated publications on wargaming theory and practice relevant to military education and planning.

King?s Wargaming Network

Academic network advancing theory and application of wargaming for research and teaching within Security Studies.

Google Data Analytics Certificate (Audit Free)

Comprehensive beginner-to-intermediate program covering spreadsheets, SQL, R, visualization, and analytics workflows; free in audit mode.

GeeksforGeeks Python Programming

Extensive collection of Python tutorials, code snippets, and explanations for basic to advanced topics, including algorithms.