mantragora
CGSociety have the best destruction tutorial for Houdini. I wouldn't even touch anything else.
You have to remember that H14 and H15 changed a lot, so all (like 98%) of the tutorials out there will not cover those changes and you may have problem with following them if you are not experienced with Houdini.
I'm in the same situation but in the other hand I learn the basics of Houdini, the procedural modeling, etc.
I'm migrate from Maya and now the intention is to specialize in FX only like RBD, Flip; Pyro, grain, etc.
My Houdini version is 15, not recomend this version now? More more changes respect de Houdini 14?
Many thanks