I haven't seen what Jordan posted, but rocks like this can also be made by using the displaceble cubes (or spheres, but in this case I'd use cubes). Just stack a few and use horizontally XZ stretched noise to displace. You can tilt those horizontal cracks a bit by rotating through transform shader for each block, e.g.
And regarding 'paying back'; it's always like that, early on you're dependent upon more knowledgeable users, years later you might know the answers to questions by novices and start helping out. Or find something interesting and new to share.