This document discusses different types of slopes, including natural slopes formed by natural causes and man-made slopes used in construction projects. It describes infinite slopes, which extend over great distances, and finite slopes, which have defined top and base surfaces. The document defines factor of safety for slopes and provides equations to calculate factor of safety. Methods for analyzing stability of infinite and finite slopes are presented for different soil types, including cohesionless, cohesive, and cohesive-frictional soils. The effect of seepage on slope stability is also discussed. Finally, solutions for improving unstable slopes such as ground improvement techniques are summarized.