https://smart-interface-design-patterns.com/articles/error-messages-ux/
Error Messages UX – Smart Interface Design Patterns
When errors should live above input fields and why toast error messages usually aren't a very good idea.
error messages uxinterface design patternssmart
https://design4users.com/ux-design-error-screens-and-messages/
UX Design Practices for Error Screens and Messages — Design4Users
Handy insights on UX design of error screens and writing error messages: learn how to smoothen the negative effect of dealing with errors.
ux designerror screenspracticesmessages