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Learning links
10 September 2025
GRE Prep
Manhattan Prep GRE Resources

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

Books
Designing Machine Learning Systems

Chip Huyen

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

R
DataCamp (Free R Tutorials)

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

PowerBI
Enterprise DNA Blog

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

Data Analytics
FreeCodeCamp - Data Analysis with Python

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

Math
Alison

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

R
CRAN R Project Documentation

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

R
Swirl: Learn R in R

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

Data Analytics
DataCamp Free Courses

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

Data Analytics
Kaggle Learn - Data Analysis

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

Data Analytics
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.

Wargaming
Naval War College ? Wargaming Department

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

Data Analytics
Analytics Vidhya

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

GRE Prep
Kaplan GRE Free Resources

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

GRE Prep
Test Guide - GRE Practice

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

PowerBI
SQLBI

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

Databases & SQL
PostgreSQL Tutorial

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

Databases & SQL
Khan Academy - Intro to SQL

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

Python
Kaggle Learn Python

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

R
ModernDive: Statistical Inference via Data Science

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