easyjoey
If I don't understand all the tools, then I am limited with what I am able to create while using Sonar.
You should not think of it this way because a) it's not really true but b) if this is how you view it that is what will limit your creativity.
Yes, there are definitely a LOT of tools/areas/features/etc, many of which are extremely complex but in general it's all fairly compartmentalized. You can just learn the stuff that is useful to you and safely ignore the rest until you get curious or your needs grow.
For example the first month I used Sonar I just figured out...
How to setup my interface, how to operate the transport and MSR controls, VERY basic editing in Track View, how to import files like drum loops, how to insert FX and how to do a basic export.
That was all I needed to put together a song (which I did a couple of as well as a small part on a collab within that first month or so). It wasn't all that easy at first and it was a little messy but it got done.
Ever since then I've been widdling away at all the other stuff peeling back the many layers of Sonar like an onion. 3 and half years later I'd say I have at least a basic understanding of 90% of the program and all the tools (like the FX and synths) and maybe an intermediate to advanced understanding of about 60% of that (things like tracking, editing, routing, navigation of projects and the program, etc are second nature to me now simply from working with the program regularly).
Fact is even though I've spent an insane amount of time watching vids, reading the manual, scouring the forum and just testing things out I probably only touch about 10% of the program throughout a project (the bulk of which is that stuff I learned in the first month).
The only real benefit I get from having obsessively studying it so much and digging into the darker corners of the program/toolset is that now if I get some weird, crazy artsy f*ck idea I'm not as stumped as to how to go about. I can reach out and use usually not just one tool/feature but multiple possible options to see what works best (or not at all).
So if I didn't know all that weird stuff I wouldn't be stuck unable to create. I just have extra cool options to enhance what I'd normally be doing or just make it a little easier.
The other benefit is that I can now kind of understand what the heavy hitters are talking about around here (which gives me new ideas to try out) and I can offer assistance to new people (or more casual users) who are in the same boat I was a few short years ago... just like I was helped as a wailing infant newbile.
tl;dr...
Just work as you normally would and don't worry about any of the new stuff unless you want to try out some new tricks or you truly do get stuck on something. In which case just ask the forum what the best option is, do a quick read up/test of the feature and go back to creating.
No need to bog yourself down if you don't want/need to.
Cheers.