SpaceX this time tried to land both its booster rockets and the core, the main rocket body which is the largest part.
The launch was successful, so was delivering the payload and landing the boosters. But core landing failed spectacularly. It was a hard job nevertheless. And spacex hasn't landed a core successfuly yet. This probably was its first try.
Video of today's crash
https://www.youtube.com/watch?v=nxUuEHWJtlQ