Delve into the intricacies of Effective Field Theories (EFTs) in this advanced lecture, part of the School for Advanced Topics in Particle Physics (SATPP) series. Explore calculation techniques in EFTs with expert instructor Rodrigo Alonso de Pablo over the course of 1 hour and 10 minutes. Gain valuable insights into this essential tool for understanding the universe, from describing unknown physics at the TeV scale to calculating observables involving mesons and baryons. Designed for postdoctoral fellows and advanced PhD students in theoretical particle physics, this lecture builds upon a strong foundation in quantum field theory and the Standard Model. Benefit from the inclusive and diverse learning environment fostered by the International Centre for Theoretical Sciences, with a focus on advancing knowledge in high energy phenomenology.