Hillslopes are one of the most important geomorphological features to describe and classify landforms and higher up in the geomorphological hierarchy the terrestrial landscape. Their inclination, segmentation from the plateau/summit to the footslope assist in describing the gradient and is held to be the prerequisite for precise slope angle measurements. They are shaped by fluvial, mass wasting processes and to a lesser degree by cryogenic and aeolian processes leading to concave and convex profiles. As far as endogenous parameters are concerned planar and structural tectonic elements and the rock strength of the bedrock geology are decisive. Among the exogenous parameters the climate impacts on the slope angle by controlling the thickness and the composition of the weathering mantle or regolith on top of the slope at different segments.
You can subdivide the hillslope into different segments from top to bottom: (1) Interfluve with crest and with a thick weathering mantle and a high production rate of debris, (2) the valley-side slope with reduced production rate relative to the transport by wind, water and gravity. (3) the valley bottom/footslope occupied by the drainage system under the government of fluvial processes in perennial systems and wind and water in ephemeral systems.