Emergent phenomena occurring at oxide interfaces have recently garnered significant scientific attention, thanks to the advancement of atomically-precise methods for synthesizing high-quality thin films. In this presentation, I will present systematic investigations of these phenomena in oxide heterostructures using various X-ray spectroscopic and scattering techniques. Specifically, I will delve into the examination of CaMnO₃/LaNiO₃ and CaMnO₃/CaRuO₃ superlattices. The metal-to-insulator transitions and interfacial ferromagnetism, triggered by charge transfer, make CaMnO₃/LaNiO₃ superlattices an ideal materials platform for studying various electronic and magnetic phenomena. To explore the surface electronic structure, we employed angle-resolved photoemission spectroscopy (ARPES) applied to the in situ grown superlattices. Furthermore, we conducted X-ray absorption spectroscopy (XAS) and X-ray magnetic circular dichroism (XMCD) measurements to observe the emergent magnetism at the interface. To investigate the depth-resolved electronic and magnetic profiles of this superlattice, we utilized standing-wave photoemission spectroscopy (SW-XPS) and X-ray resonant magnetic reflectometry (XRMR), respectively. For the CaMnO₃/CaRuO₃ superlattice, our XRMR measurements revealed an asymmetric magnetic moment at the top and bottom interfaces. Subsequent first-principle calculations indicated that oxygen vacancies were likely responsible for this magnetic asymmetry. Additionally, I will present our ongoing measurements using spin-resolved ARPES and Momentum Microscopy as part of our future research prospects.