This book is a good read for anyone building anything, software, hardware, whatever: https://en.wikipedia.org/wiki/The_Design_of_Everyday_Things

Design is its own thing. Fundamentally it's problem solving, but design is thinking about the user of the 'designed' thing and how will they use it, what will they do with it, what will it enable them to do, how will they learn how to use it, how can it be ergonomic to the environment it will be used in and the user.

A lot of people can conceptualise a factory making widgets or a programmer writing code, but drastically few people really see the design process: sketches on paper, wireframes in figma, design as a solution to a problem, design as story telling, or aesthetics. But those outputs are not the point.

The output of a few hours in figma is not really the images of a website made, it's more about communication or articulation of the the problem being solved and the solution that will solve it.

Which is why it doesn't really matter about the tool, design is an expression, the medium whether it's a sketch or a figma mock up or a vibe-designed UI in claude design is less critical than the thought that went into it.