There are many different ways to Undo in Photoshop. Ctrl + Z is keyboard shortcut for Undo last operation, Ctrl + Alt + Z is Undo keyboard shortcut. You can Undo and from Edit > Undo or from HISTORY panel (Window > History).
Curves is adjustment in Photoshop where you can adjust colors and tones in an image.
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Image > Adjustments > Match Color
To select all colors in Photoshop at once, you can use the Magic Wand tool and set the Tolerance level to 0. This will allow you to select all colors in the image with a single click.
The app that shows colors in a picture is Photoshop.
Black as the foreground, and White as the background. I have seen blue appear as the foreground. You can change these colours to every colour of the spectrum and beyond. As far as I can see, there is no way to change the default colors.
To isolate colors in Photoshop, you can use the "Select" menu and choose "Color Range." This tool allows you to select specific colors in an image by adjusting the range and fuzziness settings. Once you have selected the desired colors, you can create a new layer or mask to isolate them.
Photoshop does not have library as InDesign for example, answer can be nothing, library is nothing in Photoshop. Other programs have libraries where you can put shapes for example to re use them. In Photoshop you can say brush library or swatches, colors library.
The vibrance tool in Photoshop increases the intensity of colors in an image without oversaturating them. It enhances the muted colors more than the already vibrant ones, resulting in a more balanced and natural look.
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Smooth transition between two or more colors.