Large-scale galaxy and cluster surveys such BOSS, eBOSS, DESI, Euclid and eRosita have brought and will bring more information on parameters of the Universe, evolution and  structure of galaxies, nature of the dark matter and dark energy. They are very important 

tools of the modern cosmology. However, theory faces significant challenges in dealing with the data. Most of the errors (statistics or systematics) are now coming from the theory, not from the measurements. I will discuss progress in the field including generation of thousands of mock galaxy and cluster catalogs, access and dissemination of results.