I read everything there is to it if we have a new, completely unfamiliar tool in the editor and i cant figure it out myself(like Behavior Trees) I dont usually check out tutorial like quick start sections unless they are short like one. I actually read through that page > summarized it and gave the link to a user in AnswerHub today in 2min., and it seems to have solved their problem so far.(Keep Simulation Changes, experimental Actor Merging tool, RenderToTexture toolset and who knows what else are things most people dont know that exist in the editor)
Otherwise i just search for whatever i need to find out and scan the page very fast - bold keywords help a lot to skip through sentences faster. Green and red info bubbles help as well if i’m just looking at the documentation to see if there are any limitations/tricks of the tool i’m using.
As a reference for a part of the documentation i find very useful and well made > .unrealengine/latest/INT/Engine/Rendering/Materials/ExpressionReference/index.html
I love how simple yet explanatory all the descriptions and screenshots are for every expression type - it’s like a funfair made of cotton candy! It never bores me to visit that section whenever i need if i’m working on a semi-complex material.