OpenStax Mathematics

Peer-reviewed, openly licensed textbooks covering college algebra, calculus, and statistics; downloadable for free in PDF or web format.

CRAN R Project Documentation

Official manuals, FAQs, and reference documentation for the R language from the Comprehensive R Archive Network.

LeetCode SQL Problems

Collection of SQL coding challenges to practice writing queries, often used in interview preparation.

SQL Shack ? Power BI

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

Naval War College ? Research & Wargaming

Institutional hub for naval and joint wargaming?education, research collaborations, and sponsor-driven games.

Stack Overflow - R Tag

A huge developer community answering detailed questions about R, packages, and applied statistics.

Programiz Python

Beginner-friendly tutorials covering Python basics, data structures, object-oriented programming, and standard libraries.

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.

RAND ? Wargaming

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

Microsoft Learn ? Power BI

Official Microsoft Learn platform with guided, hands-on modules for Power BI, covering everything from basics to advanced analytics.

Designing Machine Learning Systems

Chip Huyen

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

MiT Open CourseWare

MIT OpenCourseWare offers free access to thousands of MIT course materials?lectures, assignments, and exams?covering subjects from engineering and computer science to economics and the humanities. It's open learning at its best, with no registration required.

Enterprise DNA Blog

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

CNA ? Gaming & Integration Program

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

Quick-R (StatMethods)

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

Nexus: A Brief History of Information Networks

Brian Christian

A sweeping narrative on the evolution and impact of global information networks

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.

Kaggle Learn - Data Analysis

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

Math StackExchange

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

Python.org Official Tutorial

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