TITLE: Source on functorial algebraic geometry
QUESTION [21 upvotes]: I want to understand algebraic geometry from the functorial viewpoint. I've found a set of notes (linked below) that develop algebraic geometry from the elementary beginnings in this framework. They go under the name "Introduction to Functorial Algebraic Geometry" (following a summer course held by Grothendieck), and are in parts in an almost unreadable shape. Is there an available, elementary, and readable source which takes the functorial viewpoint?
http://www.math.jussieu.fr/~leila/grothendieckcircle/FuncAlg.pdf
EDIT: Great answers so far, thanks! I would like to add that if anyone were to have a better scan of the document linked to above, or if anyone has vol. 2 of the notes I would be very interested in aquiring a copy.

REPLY [4 votes]: Arun Debray has written up (mostly complete) lecture notes for a course on algebraic geometry taught by Sam Raskin which takes a completely functorial perspective, and doesn't take the perspective that $\mathrm{Spec}(R)$ is a topological space.
https://www.math.purdue.edu/~adebray/lecture_notes/m392c_Raskin_AG_notes.pdf