I invite you to read my letter.
I wrote these tutorials for Marissa Dominguez during a research scholarship she was awarded in 2014.
This page has some solutions to various homeworks and exams, along with some exercises and extra credit problems I wrote up while TAing AMATH 301 at UW.
Dimensions is a beautiful film about mathematics. It's free to watch online and it intuitively presents topics like stereographic projection, Julia sets, 4-dimensional objects...
Chaos is another film by the makers of Dimensions. It talks about dynamical systems and chaos. I highly recommend watching it if you're taking any class with "calculus" in the title.
This is an excellent C++ tutorial.