Hi Wes

Actually im looking for the overview of whole concept, i kinda understand most of the concepts and at the same time i understand nothing

it just didnt clicked for me
I've started to look into it to lock up two or more float expressions(, in different nodes,) together, e.g. x and y amount in tile sampler with blur amount. (To ensure that when pattern is smaller, output i less blurred)
Though I havent found an anwser,but I've realised how badly i need to comprehend that side of SD
Edit: my background is in Mari and digital/traditional painting so it is difficult for me to break trough to thoose kind of nodes