Low-mass galaxies are an important laboratory for understanding the physical processes that regulate galaxy evolution. These systems are especially sensitive to both internal effects, such as stellar feedback, and external environmental processes, including gas stripping or tidal interactions with nearby neighbors. Observations show that low-mass galaxies in isolation are overwhelmingly star-forming while satellites are typically quenched, suggesting that environment plays a central role in shutting down star formation in this regime. Much of our current understanding of these processes comes from studies of satellite galaxies in the Local Group. However, recent observations from the Satellites Around Galactic Analogs (SAGA) Survey have revealed that satellite populations around Milky Way-like galaxies beyond the Local Group are more diverse than previously expected. In this talk, I will discuss how Milky Way-like environments influence the evolution of low-mass satellite galaxies. Using optical and radio observations, I examine the structural properties and gas content of SAGA satellite galaxies. I show that satellite galaxies exhibit systematic structural differences compared to isolated galaxies of similar stellar mass, and that quenched and star-forming satellites are structurally distinct. I also present a follow-up HI survey of star-forming SAGA satellites to investigate how gas reservoirs are connected to star formation and environment. While some satellites reach high levels of gas-depletion, we find no strong dependence of HI content on projected distance from the host galaxy. Instead, gas-poor satellites exhibit structural and star-forming properties that are broadly consistent with systems transitioning toward the quenched satellite population, suggesting that quenching in these systems may proceed gradually over time. The results of this dissertation contribute to a broader picture of how local environment shapes the evolution of low-mass galaxies, and help place the Milky Way and its satellites in a wider cosmological context.
