RGB curves
RGB curves are tone curves per color channel: a separate curve for red, green and blue. Lifting or lowering a channel adds color to the light or dark parts of your photo. It's the go-to way to do color grading with curves.
For warm highlights and cool shadows (the classic teal-orange), lift the red curve in the highlights and the blue in the shadows. Small moves are enough, because color casts show up fast. The bottom of a channel controls shadows, the top controls highlights. RGB curves are the engine behind many film looks and cinematic presets.
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The presets on this site set these adjustments up for you as a starting point, which you then fine-tune to taste.