Over the past couple years I have been using Blender I have watched many tutorials (paid and free) and have built up an extensive collection of shader materials that I have made from scratch and used techniques from those in the tutorials. When someone ask how to make a certain material in BSE I have a perfect (imho) shader for it but cant remember for the life of me where I learned that technique or how much I changed etc... I feel guilty if I show how I did a shader set up (even if it is tweaked to fit my scene) that I may have got from a paid tutorial.
What are your thoughts on this? Should I just not post anything if I cant remember where I learned that technique from? Or even if I do remember Should I not post at all to help someone if I got it from a paid service?