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.

Kaplan GRE Free Resources

Free practice tests, sample questions, and study materials from Kaplan.

OpenIntro Statistics

Free, open-source statistics textbook with R labs and applied data analysis examples.

Nexus: A Brief History of Information Networks

Brian Christian

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

Programiz Python

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

The Coming Wave

Mustafa Suleyman

A visionary look at how emerging technologies will reshape the 21st century

Magoosh GRE Blog

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

Kasper On BI

Blog by a Microsoft program manager sharing deep-dive explanations of Power BI features and integrations with Azure and Excel.

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.

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.

Build a Large Language Model from Scratch

Charanpal Dhanjal

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

CRAN R Project Documentation

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

SQLite Tutorial

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

UC Berkeley Data 8 (Foundations of Data Science)

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

Naval War College ? Research & Wargaming

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

edX

edX is an American massive open online course provider created by Harvard and MIT. It hosts online university-level courses in a wide range of disciplines to a worldwide student body, including some courses at no charge.

ETS GRE Official Prep

Free official materials from ETS including practice questions, POWERPREP online practice tests, and test-taker tips.

HackerRank SQL Domain

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

Harvard Business School Online - Data Science Ready (Free Modules)

Intro modules teaching how analytics applies to business decisions, tailored for managers and analysts.

The AI-Driven Leader

Erik R. Peterson

A guide to leveraging AI for smarter decision-making and leadership strategies