Problem: you're trying to apply one gradient to multiple layers, but it's being applied separately to each individual layer. Solution: watch this video :)
Problem: you're trying to change the Color Mode from RGB to CMYK (or the other way around) without rasterizing the image. But when you do that, you lose some adjustment layers, and the colors drastically change. Solution: watch this video :)
In the June 2022 release of Photoshop, Adobe is introducing the Cylindrical Transform Warp feature which allows us to curve a flat artwork to a cylindrical surface.
Problem: you're trying to add an Adjustment Layer (such as Curves) to control the RGB values, but all you're seeing is CMYK. Solution: watch this video :)