Landslides are one of the most catastrophic and common natural hazards that affect greater areas and result in serious harm to both human life and property. These hazards damage numerous networks and have an impact on urban growth and essential infrastructure, including buildings, roads, highways, dams, and other structures. Mass movement, tectonic activity, and slope instability are common in the Himalayan region because of its steep slopes and extensively sheared, crushed, and deformed rocks. Significant deformation occurred during the creation of the Himalayan orogeny, resulting in significant discontinuities such as the Main Central Thrust (MCT), Main Boundary Fault (MBT), and Himalayan Frontal Thrust (HFT). The increasing anthropogenic activities in the last few years, such as road widening, deforestation, unplanned urbanization and construction, mining, hydroelectric projects, waste disposal, quarrying and excavation, unplanned tourism, improper sewage and water supply systems, etc., seem to be aggravating the instability of slopes in the Himalayan terrain. In order to investigate these kinds of hazards and predict the failure time and risk management, remote sensing and geophysical methods such as Image Acquisition Systems, Geosensors, Terrestrial Laser Scanner (TLS), Seismic Surveys (SS), ERT, and other recent methods are available. These methods can also be used to clearly define the sliding surface depth and the landslide structure. Electrical Resistivity Tomography (ERT) is a promising non-invasive geophysical technology that may be used to construct high-resolution subsurface resistivity distribution models and test the resilience of rockfall to debris flow on both natural and hill-cut slopes. The subsurface’s lithological, hydrological, and geotechnical characteristics can all be indirectly measured using this technique.