Shader basics

Hi Unity Users!
I have next to no knowledge on what shaders are and how they work, can any one point me to a tutorial or somewhere that I can read up on shaders, this is a very big gap in my understanding of useing unity, that I would very much like to fill
Any help would be greatly appreciated
Thanks in advance!

Check my signature for lots of information about fixed function / ShaderLab. I don’t know of anywhere to get good information on how to use programmable shaders in Unity.

Thanks Jessy, I will definatly take a look!