Basic Object Static Collision

If I use an example object, say the simple default ‘cube’. How can the cube have static collision?

My current object / textures work fine in-game but, of course, the player can just walk straight through the object as there is no collision attached to it. It needs to be ‘solid’. But how?

Looking to export the object + collision in ‘wavefront.obj’ format

Using Blender 2.82a