I encapsulate here some of my main research dividing roughly into six fields. Since the beginning of my research in 1997 (when I published my first paper in 1999 in a refereed journal), while I explored many fields, mostly have been centering around compact object physics, underlying (magneto)fluid physics and nuclear astrophysics, gravitation: Einstein’s and its modification, first and second quantizations in curved spacetime and their implications in astrophysics, astroparticle physics and cosmology. Here I touch upon exciting developments done by me, and my group in some of these fields. Many more, however, are reported by many of my present and past mentees in the same volume.