Like where is the goto psych/CS UI 101 class/book/YT that over simplifies but grounds someone with no background or previous knowledge? Maybe something like the “Blender Doughnut” of great UI design?
I’ve changed UI twice with an app recently. I have a slight intuitive grasp of what I don’t like, but I lack the language and depth in this niche to express the emotional response well. I have no clue where to start with my own designs if I ever felt motivated to create one.
Start with a book called “Tog on Interface”.
The book “Design of Everyday Things” might also provide some good background.
And then there are the endless Human Interface guidelines put out by Apple and many other companies that usually try to explain the “why” behind their decisions.