Laser Pointer to CrossHair

How can i create a laser point(laser beam or whatever you wanna call it),so that i can have an indication towards where my actor-player is aiming at(and looking at) ?

There are a lot of ways to do this.

A line trace would be the easiest way with DebugDrawTraceTag
https://docs.unrealengine.com/latest/INT/Gameplay/HowTo/UseRaycasts/Blueprints/

You could also use DrawDebugLine

Or you could use a beam emitter