Strongly light-matter coupled systems are interesting from the point of view of both fundamental and applied science. Giant optical nonlinearity of exciton-polaritons can be used in quantum information applications as well as for the development of novel light sources and devices performing fast all-optical signal processing. In my talk I will review the interesting physics of polariton solitons in GaAs- based semiconductor microcavities and waveguides and will present a novel polariton platform based on atom thin van der Waals heterostructures of transition metal dicalcogenides.