Susan Rigetti released a second edition of her self‑study physics guide, "So You Want to Learn Physics," in 2021, updating the curriculum for a readership that has grown to over six hundred thousand.

The first edition was published in 2015 as an online resource intended to provide a clear, structured curriculum for individuals seeking to learn physics outside formal university programs.

The 2021 update revises textbook references, adds undergraduate electives such as astronomy and electronics, includes graduate‑level electives in quantum field theory and statistical mechanics, and incorporates feedback from readers over six years of comments and emails.

The guide remains freely available online and continues to support self‑learners pursuing physics for personal interest or as a foundation for further study.