This is yet another obvious and simple suggestion from a rather simplistic dude but it has been pretty useful for me so I thought I'd point it out.
Since we are always getting new stuff now and pretty much all of us (even our hardened veterans) are constantly learning (if you aren't you are doing something wrong... lol) it can be a little anxiety inducing and possibly counterproductive poking around at new things within our musical babies. A project in the works is going to have a lot of factors that can alter the sound, force us to bend new tools/features to accomodate the project, distract from just getting used to new stuff and in the worst case scenarios potentially crash/corrupt what we are working on.
For a while now I have been keeping "Test" projects for each version of Sonar. Most of them have veered off until full blown songs but now with Platinum I am keeping it simple. It is just a project named "Platinum Test" and all I have in it is a MIDI drum setup and one track routed to the line in on my interface for guitar/bass. No effects or nothing.
Anytime I want to try something out or study an effect/synth in detail I open this project and add what I need (currently I am giving myself a crash course on GR5 and after that will be going through all the synths I have one at a time to really learn them).
I can create presets for templates, effects, synths, etc in it. If I want to try out Sonar features or just explore I add whatever needs to be added (like I can record or drag in MIDI/audio then test things out on that). If I end up tracking some ideas I think I might want to keep and work on later I just use Save As to put it aside without screwing up the basic test project.
Because there is very little in the project to begin with it isn't weighed down with a bunch of files or other factors that might make troubleshooting issues more complex (if something screws up I can be pretty certain it's that feature or synth... not something else in the project going wonky or conflicting).
It's great for working through manuals, tuts and just jamming out on.
Once I'm done I close without saving so I can just pop it open and start all over again. Because as I try things out and create presets and templates there is no reason to save the project because if I want to insert what I've done elsewhere I can just load it from teh browser or various loaders in the program. Of course, as I said, if I actually write something I want to keep it's just a matter of doing a Save As and now I have the backbone of a new project. Alternatively I can just do an export and drag the results into a new project as a "ghost" track or backer.
Again, I know this is pretty obvious stuff but I find it useful and we've got a ton of new users it seems with the introduction of Sonar 2015 so sometimes the simplest of workflow suggestions can make a huge difference... and my back is ticking me off today (again... due to the damned spring rain) so I figured I would blather on for a while.
Peace.