Accurate modeling of free-surface waves is crucial for simulating realistic ocean conditions and for analyzing wave-structure interactions. However, replicating the wave profile at target locations, especially for irregular or steep wave groups, remains a complex and technically demanding task. The current work focuses on the numerical reproduction of free-surface waves, both regular and irregular, using the Smoothed Particle Hydrodynamics method. This Lagrangian, meshless approach is implemented with the open-source solver DualSPHysics, widely used for free-surface flows in coastal and ocean engineering applications. After a theoretical overview of the method and its properties, a two-dimensional numerical wave tank was generated and optimized for wave generation and absorption.