  In this study, we review some current studies on Gravitational Lensing for
black holes, mainly in the context of general relativity. We mainly focus on
the analytical studies related to lensing with references to observational
results. We start with reviewing lensing in spherically symmetric Schwarzschild
spacetime, showing how to calculate deflection angles before moving to the
rotating counterpart, the Kerr metric. Furthermore, we extend our studies for a
particular class of newly proposed solutions called black-bounce spacetimes and
discuss throughout the review how to explore lensing in these spacetimes and
how the various parameters can be constrained using available astrophysical and
cosmological data.
