Effective Field Theory is a concept pioneered in 1986 by Daniel Wyler and Wilfrid Buchmüller from DESY. The SMEFT, as it is called nowadays, has evolved over the years becoming a powerful tool to describe in general terms many extensions of the Standard Model. "The SMEFT at work”, published today, provides a broad introduction to this subject and a authoritative guide on how to use it for interpretation of present and future data in high-energy physics, extracting new information about the fundamental laws of Nature.