We make hundreds of decisions a day, yet almost no one is taught how to think well — how to reason clearly, spot a weak argument, resist manipulation, and solve problems without guessing. This beginner course gives you those tools in plain language, with everyday examples you will recognize instantly. You will start with the foundations of reasoning: claims, evidence, logic, and how to tell a strong argument from a persuasive but empty one. Then you will meet your own mind's shortcuts — the cognitive biases like confirmation bias and anchoring that quietly distort your judgment — and learn practical ways to catch them. From there you pick up thinking frameworks and mental models that make hard questions tractable, from first principles to weighing trade-offs. You will learn a repeatable process for making better decisions under uncertainty, and finish with a structured approach to solving real problems: define, diagnose, generate options, and choose. Nothing here is academic for its own sake — every lesson sharpens how you think at work and in life. By the end you will question smarter, get fooled less, and solve problems with a clear head.