Manhattan Prep GRE Resources

Free GRE study materials, strategy guides, and practice question sets.

Designing Machine Learning Systems

Chip Huyen

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

DataCamp (Free R Tutorials)

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

Enterprise DNA Blog

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

FreeCodeCamp - Data Analysis with Python

Full curriculum teaching Python for data analysis, including Pandas, NumPy, data cleaning, and visualization, with projects.

Alison

Free online courses from the world?s leading experts. Join 20 million learners today.

CRAN R Project Documentation

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

Swirl: Learn R in R

An interactive R package that teaches R programming and data science concepts directly inside the R console.

DataCamp Free Courses

Free beginner-friendly courses in data analysis with Python, R, and SQL; includes guided projects.

Kaggle Learn - Data Analysis

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

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.

Naval War College ? Wargaming Department

Department page describing applied gaming, methods, and how wargaming supports leadership education and analysis.

Analytics Vidhya

Wide range of free tutorials, guides, and case studies on data analytics, machine learning, and business intelligence.

Kaplan GRE Free Resources

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

Test Guide - GRE Practice

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

SQLBI

Extensive library of free articles, guides, and videos on DAX, data modeling, and BI concepts by expert consultants Alberto Ferrari and Marco Russo.

PostgreSQL Tutorial

Free tutorials covering PostgreSQL features, SQL basics, stored procedures, and advanced database functions.

Khan Academy - Intro to SQL

Beginner-friendly course teaching SQL fundamentals with practice problems and video explanations.

Kaggle Learn Python

Hands-on mini-courses for Python and data science, with notebooks you can run in the browser for immediate practice.

ModernDive: Statistical Inference via Data Science

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