Edge scrolling is used in many of the real time strategy games where the layout is usually big. This is a feature in which the user can scroll through the layou...
This tutorial is very useful but not up-to-date with Construct3 (most notably windowwidth and windowheight do not exist anymore).
It is also easier to implement in construct3 as it is not longer necessary to use AbsoluteX or Y.
e.g for scrolling to the right condition : Mouse.X > ViewportRight(0)