I spotted this useful article for those who feel they need to tweak (optimise) the picture settings, but are not sure what do do:
https://www.cnet.com/how-to/optimize-your-tv-picture-sharpness-brightness-contrast-settings-you-need-to-change-now/
Obviously any experts on here should chime in with their findings or advice, especially if geared up to LG TV models.