Unreal Engine 4 has the worst for sure. And i mean official docs as well as forums.

Answers to most questions tend to kind of boil down to "it's easy!".

As in, that's the only thing the answer will tell you. that it's easy to do. And by that implication, they don't actually need to tell you how to do it.

Or something like "it's easy, just turn this setting on/off".

Nobody will tell you, though, which tab in what window opened by which tiny button in a property grid in a window opened by which dropdown submenu under which button in what toolwindow to find that option.

Second place in the list of worst is shaders: ShaderLab/HLSL. Because they at least don't pretend that it's easy and that they're giving you answers, they usually just don't exist.