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In recent years, the Large Hadron Collider (LHC) at CERN has increasingly focused its attention on the precise measurements of SM processes, as they play a crucial role in the exploration of new physics. The emphasis on precision physics has also motivated the development of the high luminosity (HL) LHC upgrade, and the proposal of new high precision machines such as the FCC-ee. In this context, the theoretical effort has to match the experimental work, because precise measurements require an equal precision of the SM predictions. The aim of this seminar is to discuss the precision calculation of processes in the SM and Standard Model Effective Field Theory (SMEFT) framework, including Drell Yan production qq → ll and electroweak observables. The study of this area is very important, and it gives crucial information on the structure of new physics beyond the SM.