Learn how to make your regression models trustworthy, not just accurate. In this short, hands-on course, you'll explore the key assumptions behind classical linear regression and practice verifying them in RStudio. You'll fit an Ordinary Least Squares (OLS) model, visualize residuals, and detect patterns like heteroscedasticity that can distort financial forecasts. With guided discussions, a coding lab, and diagnostic interpretation, you'll build the confidence to present reliable, evidence-based results. By the end, you'll know how to test assumptions, interpret residuals, and communicate findings clearly to both analysts and decision-makers.