How can experimental searches using low threshold detectors reveal the fundamental properties of neutrinos and the nature of dark matter? My research addresses this question through precision experimental studies employing high purity point contact germanium detectors. I focus on precision measurements of coherent elastic neutrino nucleus scattering (CEνNS) within the Standard Model, searches for physics beyond the Standard Model including light dark matter interactions, and investigations of neutrinoless double-beta decay (0νββ). By leveraging low threshold germanium detector technology, complemented by advanced signal discrimination, comprehensive background characterization, and high energy resolution spectral reconstruction, I aim to achieve unprecedented sensitivity to sub-keV energy depositions and develop a versatile experimental platform for next-generation rare event searches. This talk will highlight my current research contributions and conclude with future directions in neutrino and dark matter physics.