ABSTRACT: In the age of modern cosmology, weak gravitational lensing has ascended as an indispensable tool, driving future imaging surveys such as LSST, Euclid, and CSST. Technological improvements have greatly enhanced data quality, making weak lensing, or more specifically, galaxy-galaxy lensing, a critical tool for studying galaxy evolution. Particularly, galaxy-galaxy lensing helps shed light on the physical relationship between the assembly of a galaxy and its dark matter halo, which is of paramount importance to deepen our understanding of galaxy evolution. Using the HSC and Merian surveys as examples, I will illustrate how galaxy-galaxy lensing offers a unique perspective into the galaxy-halo connection for both the most & least massive galaxies in the universe. Additionally, I'll touch upon the link between weak lensing and cosmological spectroscopic surveys, discussing their potential future applications.