  In these lecture notes the basics of QED corrections to hadronic decays are
reviewed with special emphasis on conceptual (e.g. counting and tracking of
infrared sensitive logs) rather than numerical aspects. General matters are
illustrated for the cases of increased complexity and decreased inclusiveness:
$e^+ e^- \to hadrons$, the leptonic decay $\pi^+ \to \ell^+ \bar \nu$ and the
semileptonic decay $B \to \pi \ell^+ \bar \nu$. The non-trivial and ongoing
efforts of including structure dependence are very briefly outlined.
