  Les Houches 2021 lectures on dark matter effective field theory (short
course). The aim of these two lectures is to calculate the DM-nucleus cross
section for a simple example, and then generalize to the treatment of general
effective interactions of spin-1/2 DM. Relativistic local operators, the
heavy-DM effective theory, the chiral effective Lagrangian, and nuclear
effective operators are briefly discussed.
