Clusters of galaxies trace the highest peaks in the cosmic density field and offer an independent and powerful probe of the growth of structure and cosmology. Locating clusters through well-planned multi-wavelength surveys is crucial for testing gravitational theory and cosmology. Successfully launched in July 2019, eROSITA, the German-built telescope array operating between 0.2-8 keV on board the Russian-German Spectrum-RG (SRG) mission, delivers the largest catalogs of clusters of galaxies from its All-Sky Surveys. The first eROSITA all-sky survey, yielding more than 10,000 confirmed clusters of galaxies, constrains the cosmological parameters from cluster mass function and cluster-clustering when combined with the overlapping DES, HSC, and KIDS weak lensing surveys. I will summarise the first cluster science, large scale structure, and cosmology results from eROSITA’s first All-Sky Survey and provide an outlook for future deeper surveys.