Feynman, Leighton, and Sands - The Feynman Lectures: I always look here for a good intuitive explanation. A. Zee - Quantum Field Theory in a Nutshell: this is

Feynman, Leighton, and Sands - The Feynman Lectures: I always look here for a good intuitive explanation. A. Zee - Quantum Field Theory in a Nutshell: this is so approachable and in the path integral formulation of QFT. Anyone who points you towards Peskin and Schroeder wants you to suffer. Gattringer and Lang - Quantum Chromodynamics on the Lattice: essential reading for anyone learning lattice QCD.