I also wrote some lecture notes for teaching and studying purposes. I do not claim originality for any of the lecture notes. The references are attached.
[1] Lecture Notes for Applied Calculus 1, for Purdue MA16010. Find here if you would like to study the notes lecture by lecture.
[2] Introduction to Partial Differential Equations. (still under construction)
[3] Lecture Notes for Second Order Elliptic Equations, Part 1. (still under construction)
[4] Lecture Notes for Second Order Elliptic Equations, Part 2. (still under construction)
[5] Lecture Notes on Geometric Analysis. (still under construction)