My main research interests focus on the early cosmology, especially the generation and evolution of cosmological perturbations. Originating from the quantum fluctuations on very small scales, cosmological perturbations can be stretched to all the scales and then seed the macroscopic phenomena like cosmic microwave background, large scale structure, primordial black holes, and stochastic gravitational waves. I am trying to comprehend how the largest and the smallest scales of our universe are connected by the Nature.