This document discusses population dynamics and logistic growth models. It introduces autonomous differential equations of the form y' = f(y) where t does not explicitly appear. Examples of exponential and logistic growth are presented. Qualitative analysis of the logistic model is performed through examining the direction field, equilibrium solutions, and concavity/steepness of solution curves to understand behavior without solving the differential equation. The logistic solution and its asymptotic properties are derived. Extensions to models with threshold populations are also discussed.