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Learning links
10 September 2025
Databases & SQL
MySQL Tutorial

Extensive resource for learning MySQL with examples, from installation and schema design to joins and triggers.

GRE Prep
CrunchPrep GRE Blog

Guides and strategies for GRE preparation including word lists, essay templates, and quantitative shortcuts.

Data Analytics
DataCamp Free Courses

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

Databases & SQL
SQLZoo

Hands-on SQL practice with guided problems, quizzes, and interactive database queries to reinforce concepts.

Math
OpenStax Mathematics

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

R
ModernDive: Statistical Inference via Data Science

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

Python
LearnPython.org

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

GRE Prep
Manhattan Prep GRE Resources

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

R
R-Bloggers

Aggregator of hundreds of blogs covering R tutorials, packages, and real-world data science applications.

Python
GeeksforGeeks Python Programming

Extensive collection of Python tutorials, code snippets, and explanations for basic to advanced topics, including algorithms.

Math
Saylor Academy - Mathematics

Free, full-length math courses (Linear Algebra, Abstract Algebra, Real Analysis, etc.) with exams and certificates.

Data Analytics
Dataquest Free Data Analysis Courses

Browser-based lessons in Python, SQL, and data visualization; first modules free.

Databases & SQL
SQLite Tutorial

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

Wargaming
CNA ? Gaming & Integration Program

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

Books
AI Engineering

Andrew Ng

A practical framework for building real-world AI applications from foundational principles

Databases & SQL
LeetCode SQL Problems

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

Wargaming
Marine Corps University Press ? Wargaming Topic

Curated publications on wargaming theory and practice relevant to military education and planning.

Python
PyBites Platform (Free Exercises)

Short, practical coding exercises (some free) focused on solving real-world problems in Python.

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

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

Python
Python.org Official Tutorial

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