Directions on how to do user interaction with predefined meshes

Hi there,

I’m working on a game that needs user interaction. Imagine a game where the user needs to think and place predefined objects (rails, boxes, ramps, etc) to continue playing. These predefined objects are placed and snapped into the scene, and they affect the physics of other objects.

To where should I be looking? UE4’s documentation is fantastic but I don’t know where to start looking or what terms to use as I just started with the engine.

Regards,

Maybe this?