29 resources · 25 free
Critical Thinking & Problem Solving
Think clearly and solve problems — logic, frameworks, and decisions.
Unlock Your Intelligent Mind: Consciousness & Creativity
Unlock your intelligent mind: consciousness, creativity, and mental frameworks for sharper thinking.
Critical Thinking for Leadership & Management Basics!!
Critical thinking fundamentals for leadership and management: better decisions, reasoning, and judgment.
Course Lectures: Spring 2011 Critical Thinking (YouTube)
YouTube playlist: full course lectures — Spring 2011 Critical Thinking (college-level reasoning and logic).
Critical Thinking (Wi-Phi) — Khan Academy
Khan Academy partner content: Wireless Philosophy (Wi-Phi) critical thinking series — arguments, reasoning, and logic fundamentals.
EDU406: Critical Thinking and Reflective Practice (YouTube)
YouTube playlist: EDU406 — Critical Thinking and Reflective Practice (structured course lectures).
Critical Thinking Skills for University Success (Coursera)
Free-audit MOOC from the University of Sydney that teaches critical thinking for academic and professional contexts. Six modules cover logic and reasoning, argumentation, identifying bias in arguments, and using evidence to support claims, with a summative assignment for practice. Best for students preparing for university and professionals who want structured, university-level critical thinking training. Free with limits.
Critical Thinking at University: An Introduction (FutureLearn)
A two-week introductory course from the University of Leeds on FutureLearn designed for students entering or returning to university study. It defines critical thinking, introduces a practical model, and offers strategies for evaluating arguments and sources across disciplines, with discussion steps for practice. More than 42,000 learners enrolled and rated 4.7. Free limited access is available, with optional paid upgrades for certificates and full course access. Free with limits.
Critical Thinking Web (University of Hong Kong)
Free educational website by Dr. Joe Lau of the University of Hong Kong offering more than 100 tutorials on critical thinking, logic, and creativity, plus interactive quizzes such as the hardest logic puzzle in the world, short deduction quizzes, and consistency tests for your moral beliefs. Includes a free downloadable miniguide to critical thinking. Ideal for self-directed learners and teachers seeking classroom-ready materials, and it has been maintained free and ad-free since 2004.
Think Again I: How to Understand Arguments (Duke)
First course in Duke University's Introduction to Logic and Critical Thinking specialization, taught by Walter Sinnott-Armstrong and Ram Neta. Learners practice identifying arguments, breaking them into premises and conclusions, reconstructing them with suppressed premises, and evaluating validity and soundness through exercises and quizzes. Designed for anyone who wants to reason better in daily life, from students to professionals. Free to audit; certificate requires payment.
Foundation for Critical Thinking Public Library
Public library from the nonprofit Foundation for Critical Thinking, founded by Richard Paul and Linda Elder, with free articles, thinker's guides, exercises, and videos on critical thinking concepts, Socratic questioning, analytic thinking, and fallacies. The library supports educators and self-learners in cultivating fair-minded, disciplined thinking. A larger community library is available with membership, but this public collection of guides and resources is free and substantial.
r/criticalthinking
Reddit community of more than 100,000 members discussing critical thinking theory, practice, and everyday application. Members share articles, thought experiments, reasoning exercises, and debates, making it a good place to practice evaluating arguments and receive feedback from others. Free to browse and join. Useful alongside structured courses for ongoing practice and exposure to real-world reasoning problems.
Your Logical Fallacy Is
Interactive website that teaches 24 common logical fallacies with clear definitions, everyday examples, and individual pages explaining how each fallacy works. Includes free downloadable PDF posters and printable critical thinking cards published under Creative Commons, widely used in classrooms and debate training. Great for students, debaters, and anyone who wants to learn to spot flawed reasoning in media, politics, and conversation.
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Succeeding in Postgraduate Study (OpenLearn)
Free badged open course from The Open University on OpenLearn covering critical thinking, analysis, reflection, and academic writing at Master's level. Eight sessions include interactive quizzes, a free statement of participation, and an Open University digital badge on completion, and the course is accredited by the CPD Standards Office. Perfect for postgraduate students or professionals returning to study who want to strengthen critical and reflective thinking.
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Introduction to Logic (Stanford) on edX
Stanford University's classic introduction to logic, available for free audit on edX, teaches formal reasoning, truth tables, proofs, and logical validity through video lectures and graded exercises. Ideal for critical thinkers who want rigorous, systematic tools for evaluating arguments. Learners can upgrade for a certificate, but auditing the full course costs nothing.
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Foundation for Critical Thinking Resources
The Foundation for Critical Thinking offers free articles, thinker's guides, and teaching resources built around its framework of intellectual standards such as clarity, accuracy, and fairness. The library helps learners self-assess their reasoning and apply structured questioning in academic and professional contexts. A scholarly, deep-dive destination for studying critical thinking theory.
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Logically Fallacious
A searchable encyclopedia of logical fallacies, each explained with definitions, examples, and everyday variants. Learners can study dozens of common reasoning errors and use the collection as a reference while reading news or debating. The book-format site doubles as both a teaching text and a practical checklist for spotting weak arguments.
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Khan Academy LSAT Prep Logical Reasoning
Khan Academy's free LSAT prep course, created in partnership with the LSAC, includes hundreds of official logical reasoning questions with step-by-step explanations and performance tracking. Because the LSAT's logical reasoning section tests formal argument analysis, this practice library trains exactly the skills critical thinking demands, including identifying assumptions, flaws, and strengtheners.
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Farnam Street
A blog dedicated to mental models, decision making, and clear thinking, curated by Shane Parrish, with deep articles that distill ideas from psychology, economics, and philosophy into practical frameworks. The free archive covers cognitive biases, probabilistic reasoning, and strategies for better judgment, while the Knowledge Project podcast brings extended conversations with leading thinkers. It is a rich free library for anyone training themselves to think more rigorously.
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LessWrong
A community and blog dedicated to rationality, Bayesian reasoning, and improving decision-making. Contains classic sequences of posts on cognitive biases, probabilistic thinking, and epistemics. For self-learners who want deep, rigorous thinking tools beyond mainstream pop-psychology.
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The Decision Lab
A behavioral-science publication explaining why we think and act the way we do. Includes a searchable library of cognitive biases with real-world examples and practical solutions. For students and professionals who want evidence-based insight into judgment and decision-making.
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The Fallacy Files
A comprehensive, searchable encyclopedia of logical fallacies with definitions, examples, and historical background. Organized by category so you can learn to spot flawed reasoning in arguments. For students, debaters, and anyone sharpening their argument-analysis skills.
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RationalWiki
A collaborative wiki analyzing pseudoscience, logical fallacies, and flawed arguments from a skeptical, evidence-based standpoint. Articles dissect bad reasoning with citations and humor. For readers who want to practice spotting weak arguments in the wild and understand how misinformation spreads.
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Kialo
A free platform for structured, visual debates where arguments are mapped into pro/con trees instead of shouting matches. Practice forming, evaluating, and rebutting claims on thousands of topics. For students, classrooms, and teams building argument-mapping and critical discussion skills.
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Cognitive Bias Codex
The famous interactive poster cataloging over 180 cognitive biases, organized by the four problems they solve: information overload, meaning, memory, and action. Click any bias for a plain-English explanation. For anyone who wants a visual map of human irrationality at a glance.
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ASQ Five Whys
The American Society for Quality's free guide to the 5 Whys root-cause analysis technique, with examples and facilitation tips. Learn to move from symptoms to the underlying causes of a problem. For problem solvers, process-improvement teams, and managers running investigations.
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Systems Innovation
A YouTube channel with full-length free courses on systems thinking, complexity, and network science. Video series explain feedback loops, emergence, and system dynamics with clear visuals. For learners who want structured systems-thinking education without paying for a course platform.
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Donella Meadows Project
The online archive of Donella Meadows, author of Thinking in Systems, including her landmark essays on leverage points and system traps. Free full texts plus a systems-thinking resource library. For readers who want the foundational texts of systems thinking in one place.
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BrainDen Lateral Thinking Puzzles
A large collection of classic lateral-thinking puzzles with answers and step-by-step reasoning. Practice questioning assumptions and finding non-obvious solutions. For puzzle lovers, students, and teams warming up their creative problem-solving muscles.
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List of Cognitive Biases
Open encyclopedia entry cataloging over 180 documented cognitive biases, from confirmation bias and anchoring to the Dunning-Kruger effect. Each bias links to a detailed article with definitions, examples, and research references. Free to read and cite; an ideal quick reference for decision frameworks and debiasing practice. Community-maintained and regularly updated.
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