<p>Stellar coronae exhibit diverse properties across different stellar environments. However, the underlying physics that governs this diversity remains incompletely understood. In this review, we summarize recent theoretical and observational efforts to characterize coronae under various stellar conditions, with a particular focus on the role of metallicity in coronal heating. We present scaling laws for coronal loops that explicitly incorporate metallicity dependence, extending conventional models of coronal structure. To evaluate these theoretical predictions, we perform one-dimensional magnetohydrodynamic (MHD) simulations of coronal loops, which account for dynamic processes such as wave propagation, shock dissipation, and turbulent heating. The simulations reveal that lower-metallicity environments lead to higher coronal densities and temperatures due to reduced radiative cooling efficiencies. We compare the simulation results with our scaling relations and with observational data from stellar X-ray studies. The overall agreement supports the validity of the metallicity-dependent model and helps to explain previous observations of bright, metal-poor coronae.</p>