Thermal management is a crucial factor in the development of miniaturized nano-electronic devices. 2D materials have been proposed as active materials in novel transistor circuits, as well as heat-transporting layers in conventional devices. In both these scenarios, it is important to address the bottleneck arising from thermal transport. In 2D materials, the dominant heat carriers are phonons. The proposed work aims to study the thermal transport of 2D van der Waals materials, especially Transition metal dichalcogenides (TMDs) and TMD heterostructures using the Raman Opto-thermal technique. The in-plane thermal conductivity of the 2D material and the interfacial thermal conductance with the substrate will be experimentally determined. Finite element analysis will be used to model the system and extract the thermal parameters. The effect of temperature, defect density, and layer rotations on thermal transport will also be investigated, which can shed light on the microscopic phonon scattering processes. This study will provide valuable insights for the proper integration of 2D materials in nanoelectronic devices and for thermal engineering at the nanoscale.