Resolve noise question I'm quite new to Resolve and grading and have a basic question that I haven't seen answered after searching the web.  

Say I'm balancing my shot on my first node.  It's a little bit over-exposed in general and I bring the exposure down and do the other corrections to get it looking normal.

On my next node, I tweak exposure and want a little bit more luma in the shadows.  My question is - will I be introducing noise into the shadows?  Or does Resolve refer to the original 'raw' image?

If it does introduce noise, why do people insist on balancing the image on the first node?  Wouldn't that introduce artefacts to the image later on down the node chain?