Difference between Gamma Correction and RenderSettings.ambientLight

So, I've been reading up on gamma correction, but I was initially using RenderSettings.ambientLight and lerping between a light grey and a dark grey to change my ambient light based on a slider. While this does work, I did notice that it didn't affect actual light objects, which is a little bit of a struggle. I was reading a little about gamma as I previously stated and tried to use the ColorCorrection Curves ImageEffect and it made everything look off... So did I do something wrong, or is the correction how my objects are suppose to look. Thank you in advance!