Adding a small square '?' with a set of strings inside it, either opening a window / being a tooltip for how you do the FAQ.
My suggestion to make the game more fool-proof would be
-First time 'tutorial' for commonly used functions
-Tool tips that explain how you do difference things
-The question mark where it explains in strings how to do X & Y
-Add a question mark box which links to the GitHub Wiki

For example: As 'How do I start a server' is one really requested feature, why not link them to the wiki/make a window explaining it
This is usually another button next to the X (close button).
@IntelOrca Differs per platform. Also, if i remember correctly, the titlebarbutton on Windows triggers a question mark cursor, so that's something different.

Also, I think it would be a better idea to make the interface itself more clear than to write documentation.
What the question mark does depends on the program.
There are some ways this could be tackled tho, it's mostly as a helping hand to users
Depends on how viable it should be
My thought now would be a question mark for windows that prompts up a window saying 'This will take you to the OpenRCT2 wiki page for this window, Are you sure? [YES/CANCEL]
Also, I think it would be a better idea to make the interface itself more clear than to write documentation.
:+1:
@Nubbie The problem with the 'open documentation in browser' approach is that the documentation is _very_ likely to not get updated as much as the UI itself.
Not to mention some might find it annoying (especially on slow machines, think EEE PC or anything with a very slow cpu)
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This is usually another button next to the X (close button).