OpenIntro Statistics
Free, open-source statistics textbook with R labs and applied data analysis examples.
ModernDive: Statistical Inference via Data Science
Free online textbook teaching statistical inference and regression using R and tidyverse methods.
W3Schools Python
Step-by-step interactive lessons for Python basics, data structures, and functions, with hands-on coding snippets.
W3Schools SQL
Beginner-friendly SQL tutorials with examples of queries, joins, constraints, and subqueries, plus an interactive editor.
Kaplan GRE Free Resources
Free practice tests, sample questions, and study materials from Kaplan.
Automate the Boring Stuff with Python
A free online book teaching Python through practical examples like automating tasks, web scraping, and file management.
AI Engineering
Andrew Ng
A practical framework for building real-world AI applications from foundational principles
SQLite Tutorial
Focused tutorials on SQLite, covering SQL basics, database management, and practical coding examples.
Manhattan Prep GRE Resources
Free GRE study materials, strategy guides, and practice question sets.
PyBites Platform (Free Exercises)
Short, practical coding exercises (some free) focused on solving real-world problems in Python.
The Coming Wave
Mustafa Suleyman
A visionary look at how emerging technologies will reshape the 21st century
King?s Wargaming Network
Academic network advancing theory and application of wargaming for research and teaching within Security Studies.
LeetCode SQL Problems
Collection of SQL coding challenges to practice writing queries, often used in interview preparation.
Quick-R (StatMethods)
Practical R tutorials focused on statistics, graphics, and data analysis, written in a straightforward, example-driven style.
Stack Overflow - R Tag
A huge developer community answering detailed questions about R, packages, and applied statistics.
Coursera - Math for Machine Learning (Audit Free)
University of London courses on linear algebra, multivariate calculus, and statistics for machine learning, available free in audit mode.
StatQuest with Josh Starmer (YouTube)
Clear and approachable explanations of statistics and data analysis, breaking down complex concepts into simple steps.
Mode SQL Tutorial
Practical SQL lessons taught in-browser, with real-world datasets and instant feedback for analysts.
Power BI Community
Official Power BI community forum where users can ask questions, share solutions, and browse a large knowledge base of solved problems.
Khan Academy - Intro to SQL
Beginner-friendly course teaching SQL fundamentals with practice problems and video explanations.