DataCamp

DataCamp is an online learning platform that specializes in data science, analytics, and artificial intelligence, offering interactive courses in Python, SQL, R, and other key technologies. Learners can build practical skills through hands-on coding exercises, real-world projects, and guided career tracks?all accessible from a browser at their own pace.

Build a Large Language Model from Scratch

Charanpal Dhanjal

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

ModernDive: Statistical Inference via Data Science

Free online textbook teaching statistical inference and regression using R and tidyverse methods.

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.

Test Guide - GRE Practice

Large collection of free online GRE practice tests and section-specific drills.

LeetCode SQL Problems

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

Princeton Review GRE Practice

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

Project Euler

Hundreds of challenging computational math problems that build problem-solving and programming skills.

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.

Stack Overflow - R Tag

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

MOOC.fi - Introduction to Data Analysis with Python

Free course from University of Helsinki teaching data analysis workflows with Python and Pandas.

LearnPython.org

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

Kaggle Learn - Data Analysis

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

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

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

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.

King?s Wargaming Network

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

Mode Analytics SQL & Analytics Tutorials

Hands-on tutorials that blend SQL queries with practical data analysis tasks for business analysts.

ETS GRE Official Prep

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

The AI-Driven Leader

Erik R. Peterson

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