Cosmology Paradigm Changes

I describe here my background and main steps in my studies. Each following step was a basis for the next one without a certain plan. I started my path with the study of kinematical properties of galactic populations, which smoothly transformed into the calculation of population models of galaxies. I had difficulties in satisfactorily modeling galaxies using population data; this led me to the dark matter problem. Discussing dark matter started a collaboration with Yakov Zel'dovich, which initiated the search for regularities in the distribution of galaxies. The detection of the supercluster-void network or the cosmic web followed.