 The Rising Sea: Foundations of Algebraic Geometry by Ravi Vakil (2017 draft)

By Ravi Vakil. The title page identifies the November 18, 2017 draft. Author-hosted PDF: math.stanford.edu/~vakil/216blog/FOAGnov1817public.pdf

Consulted passages: §0.4 (goals and polynomial equations), Chapter 3 (affine schemes), and the sections on rational maps and birational morphisms.