Where can I get tutorials, books on pure OpenGL ES2?

Question

Android

I'm starting to learn OpenGL ES2. I would like to study it in its purest form in order to better understand, i.e. without using various additional libraries. Those. without GLUT and others.
1. What tutorials or books can you recommend?
2. I am also interested in the connection of graphics with various game actions (the hero fell into the abyss, there was a tap on the screen). Is it implemented in Java classes? Or also in C++?
This refers to the Android NDK.

Answer 1

https://github.com/e7mac/Stanford/blob/master/CS14... recommend :)