This is about reducing banding effects in gradients by introducing noise. A nice approach is a displacement map using SVG filters.| frontendmasters.com
Wondering what would be trendy in 2022? No worries. We got you covered. Here's our latest blog on email design trends for 2022.| MailBakery
How to create a complex but highly customizable background gradient that can be modified easily using CSS custom properties.| Space Ninja
Creating gradients is normally a manual process involving lots and lots of testing and tweaking. Why not grab existing gradient styles from this Figma UI| UI Kits for Figma