DataCamp (Free R Tutorials)
While DataCamp is subscription-based, it offers free introductory R courses covering basics, data manipulation, and visualization.
The AI-Driven Leader
Erik R. Peterson
A guide to leveraging AI for smarter decision-making and leadership strategies
Google Data Analytics Certificate (Audit Free)
Comprehensive beginner-to-intermediate program covering spreadsheets, SQL, R, visualization, and analytics workflows; free in audit mode.
AI Engineering
Andrew Ng
A practical framework for building real-world AI applications from foundational principles
HackerRank SQL Domain
SQL challenges of varying difficulty levels with instant online feedback, great for structured practice.
Nexus: A Brief History of Information Networks
Brian Christian
A sweeping narrative on the evolution and impact of global information networks
GeeksforGeeks Python Programming
Extensive collection of Python tutorials, code snippets, and explanations for basic to advanced topics, including algorithms.
Mode Analytics SQL & Analytics Tutorials
Hands-on tutorials that blend SQL queries with practical data analysis tasks for business analysts.
SQLite Tutorial
Focused tutorials on SQLite, covering SQL basics, database management, and practical coding examples.
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.
StatQuest with Josh Starmer (YouTube)
Clear and approachable explanations of statistics and data analysis, breaking down complex concepts into simple steps.
Springboard Data Analytics Curriculum (Free Prep)
Introductory lessons and exercises to build foundation skills in Excel, SQL, and data storytelling.
The Coming Wave
Mustafa Suleyman
A visionary look at how emerging technologies will reshape the 21st century
Kaplan GRE Free Resources
Free practice tests, sample questions, and study materials from Kaplan.
MySQL Tutorial
Extensive resource for learning MySQL with examples, from installation and schema design to joins and triggers.
Manhattan Review Free GRE Resources
Free practice problems, diagnostic tests, and study tips from test prep experts.
CNA ? Gaming & Integration Program
Designs, facilitates, and analyzes sponsor-focused wargames for DoD and government decision-makers.
Saylor Academy - Mathematics
Free, full-length math courses (Linear Algebra, Abstract Algebra, Real Analysis, etc.) with exams and certificates.
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.