  These lectures, presented at TASI 2018, provide a concise introduction to
inflation, baryogenesis, and aspects of dark matter not covered by the other
lectures. The emphasis for inflation is an intuitive understanding and
techniques for constraining inflationary models. For baryogenesis we focus on
two examples, leptogenesis and electroweak baryogenesis, with attention to
singlet-assisted two-step phase transitions. Concerning dark matter, we review
different classes of models distinguished by their mechanisms for obtaining the
observed relic density, including thermal freeze-out, asymmetric dark matter,
freeze-in, SIMP dark matter, the misalignment mechanism for ultralight scalars
and axions, and production of primordial black holes during inflation. Problem
sets are provided.
