  Superconformal field theory with $\mathcal{N}=2$ supersymmetry in four
dimensional spacetime provides a prime playground to study strongly coupled
phenomena in quantum field theory. Its rigid structure ensures valuable
analytic control over non-perturbative effects, yet the theory is still
flexible enough to incorporate a large landscape of quantum systems. Here we
aim to offer a guidebook to fundamental features of the 4d $\mathcal{N}=2$
superconformal field theories and basic tools to construct them in
string/M-/F-theory. The content is based on a series of lectures at the Quantum
Field Theories and Geometry School
(https://sites.google.com/view/qftandgeometrysummerschool/home) in July 2020.
