How to code GLSL shaders?

[EEVV]

So before you ask me, I know how to code in lua, atleast I know what I need to know
But I wanted to create some glsl shaders to make my work transition into a higher standard, but the problem is that I haven't found any website to start learning, I have even checked the opengl website, and it suddenly throws you into some chunks of code.

Can anyone link me to a website that doesn't begin with google.com or google.com/search ?
Or give me a glsl shader file with comments on what the functions do.
I want to create a blur glsl shader, but don't send me a blur shader without comments, it confusing

Thanks for reading this

[micha]

Have a look at Omar's introduction to shaders on the LÖVE blogs.