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Learning links
10 September 2025
R
DataCamp (Free R Tutorials)

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

Books
The AI-Driven Leader

Erik R. Peterson

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

Data Analytics
Google Data Analytics Certificate (Audit Free)

Comprehensive beginner-to-intermediate program covering spreadsheets, SQL, R, visualization, and analytics workflows; free in audit mode.

Books
AI Engineering

Andrew Ng

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

Databases & SQL
HackerRank SQL Domain

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

Books
Nexus: A Brief History of Information Networks

Brian Christian

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

Python
GeeksforGeeks Python Programming

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

Data Analytics
Mode Analytics SQL & Analytics Tutorials

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

Databases & SQL
SQLite Tutorial

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

R
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.

Data Analytics
StatQuest with Josh Starmer (YouTube)

Clear and approachable explanations of statistics and data analysis, breaking down complex concepts into simple steps.

Data Analytics
Springboard Data Analytics Curriculum (Free Prep)

Introductory lessons and exercises to build foundation skills in Excel, SQL, and data storytelling.

Books
The Coming Wave

Mustafa Suleyman

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

GRE Prep
Kaplan GRE Free Resources

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

Databases & SQL
MySQL Tutorial

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

GRE Prep
Manhattan Review Free GRE Resources

Free practice problems, diagnostic tests, and study tips from test prep experts.

Wargaming
CNA ? Gaming & Integration Program

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

Databases & SQL
SQLZoo

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

Math
Saylor Academy - Mathematics

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

General Learning
MiT Open CourseWare

MIT OpenCourseWare offers free access to thousands of MIT course materials?lectures, assignments, and exams?covering subjects from engineering and computer science to economics and the humanities. It's open learning at its best, with no registration required.