Jets initiated by the hadronic decays of heavy particles, such as the Higgs, Z, and W bosons, encode rich information about the Standard Model and possible new physics. However, this information is obscured by the complex patterns of QCD radiation and hadronization inside the jet. In this talk, I will discuss how energy correlators provide a simple and analytically controlled framework for studying jet substructure in boosted massive-particle decays. The central idea is to compute energy correlators in the rest frame of the decaying particle and then map them to the boosted frame. I will first illustrate this approach using the two-point energy correlator (EEC) in hadronic Higgs decays, where the boosted two-body decay appears as a characteristic angular peak, while smaller-angle structures probe QCD dynamics across perturbative and nonperturbative scales. I will then discuss the extension to hadronic Z and W decays, where the boost maps polarization-dependent decay patterns into distinctive features of the EEC。