  These notes are an overview of effective field theory (EFT) methods. I
discuss toy model EFTs, chiral perturbation theory, Fermi liquid theory, and
non-relativistic QED, and use these examples to introduce a variety of EFT
concepts, including: matching a tree and loop level; summation of large
logarithms; naturalness problems; spurion fields; coset construction;
Wess-Zumino-Witten terms; chiral and gauge anomalies; field rephasings; and
method of regions. These lecture notes were prepared for the 2nd Joint
ICTP-Trieste/ICTP-SAIFR school on Particle Physics, Sao Paulo, Brazil, June 22
- July 3, 2020.
