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.