Dipolar bosons trapped in optical lattices represent an important subject in condensed matter physics due to their wide range of applications in quantum technologies and the potential to be used as quantum simulator to study more complex strongly-correlated systems. The presence of long-range and anisotropic dipolar interactions makes these systems very good candidates to realize exotic states of matter and study quantum phase transitions. In this thesis, we consider a system of ultracold bosons confined into a two-dimensional square optical lattice and interacting via dipole-dipole interaction. Starting from the zero temperature phase diagram and the results obtained in the draft paper “Effect of Harmonic potential in Anisotropic Dipolar Lattice Bosons” by Y.