Abstract. I’ll show the analysis we perform on gravitational microlensing signatures and how we estimate gravitational microlensing parameters to obtain information about several components of the dark matter in our galaxy like free-floating planets, brown dwarfs, primordial black holes, making use of actual and future space-based telescopes: Euclid, THESEUS, Gaia, Roman, etc. We are also focused on strong lensing from foreground galaxies of the time-variable sources like quasars, as a valuable tool for cosmological investigations, especially for constraining the value of the Hubble constant.