Help creating overhangs in random terrain generation

As open test for my survival game is soon, I want to improve on the terrain generation (again). This time, with overhangs. (I use roblox’s built-in terrain system)

An example: Voxel generation - #12 by ThanksRoBama

I can’t say I fully understood the post above, so if someone could lead me in the right direction that would be great.