  These lecture notes, prepared for the 2022 QUC summer school at KIAS, provide
an introduction to Higgs Effective Field Theory and the use of field geometry
in Quantum Field Theory. While not sounding the depths of any of these topics,
we will cover and give a sense of the inner workings of: the action for
Goldstone bosons, the independence of scattering amplitudes from field
parametrisations, linear vs non-linear realizations --their `geography' and
experimental prospects to tell them apart--, ultra-violet completions and the
LSZ formula for fields in curved space.
