LessWrong
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Community tag page collecting LessWrong posts on how to attack hard problems, covering techniques like babble-and-prune, problem decomposition, and noticing confusion. Quality varies by post, but the better essays give concrete, testable methods rather than general advice.
More resources on Problem Solving
The Decision Corner
The Decision Corner connects you with cutting-edge insights from the world's best applied behavioral scientists to bring wisdom to your daily and professional life. Rather than talking about nudges and trying to codify science into design principles, TDC goes deep and finds out just how the world's brightest minds solve complex real-world problems using the social sciences.
hbr.org
Harvard Business Review (hbr.org) offers research-based articles, case studies, and practical guidance on leadership, strategy, and organizational performance for managers and executives.
lesswrong.com
LessWrong is a community blog and forum focused on rationality, decision theory, and cognitive biases. It features long-form essays and discussions, including the popular Sequences on Bayesian reasoning, critical thinking, and AI risk.
artofproblemsolving.com
AoPS is a comprehensive mathematics learning community offering challenging problems, step-by-step solutions, and active forums, along with online courses and textbooks for competition math. It provides problem sets, tutorials, and classroom resources covering topics from fundamentals to advanced contest math.
Farnam Street
Shane Parrish's collection of essays on problem-solving methods drawn from mental models, first-principles reasoning, and inversion. The posts summarise ideas from other thinkers, so treat them as a readable entry point rather than a primary source.
Solving Problems with Creative and Critical Thinking
Sharpen your problem-solving skills! Learn creative and critical thinking techniques with this course from Imperial College London.