Well as a new user to steem/steemit I've been struggling to wrap my head around the uses for the different aspects of steem as well. Power is very obvious and holds the most well power of the 3. SBD, it seems I have little use for at the moment (not looking to cash out since I just bought in) and other than voting bots there really isn't a way to spend it. STEEM itself, well thats the most versatile of the 3. Fully liquid, transferable and can be used for many of the same things as SBD.

So I continue to muddle through, learning as I go, testing the different waters and methods in the hope that I can find one that works for me