I've found that people that learned class-based React first and then switched to modern function-based React often have more trouble with useEffect than people who learned functional components directly

I think a big part of the problem is we need to stop selling useEffect as a replacement for the lifecycle methods of class based components. It also probably would've been a lot less confusing if we called it something like useSideEffect

I think any react linting setup resolves most of the confusion but there's a lot of people that start off and don't even know how to set up lint rules for react. They should be a default in any react app imo