RTX HDR questions (SDR related as well)

for the below settings:

https://i.imgur.com/PCY0znF.png

  1. what if I have an SDR (non-oled) monitor. what should the values be?
  2. Is there a way to have these values for my LG G3 but different values for my SDR (non-oled) monitor?
  3. If I messed up and changed the values to the below on my SDR monitor, how can I revert them? Anywhere to find the default values?
 
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