In addition to the great videos/tutorials/books out there (free and for purchase), you can also find a lot of resolutions to things that confuse you here in the forums.
To search the Cakewalk site, I suggest using Google, using the following, followed by whatever you are trying to search for:
site:forum.cakewalk.com
example: site:forum.cakewalk.com x3 power book
example: site:forum.cakewalk.com export audio mp3
example: site:forum.cakewalk.com complete removal sonar registry
You get the idea. If you want to narrow results, add additional terms, to narrow it down, like including X3 to limit the search by release, etc...
Anyways, the forums are a great research tool, in addition to tutorials and videos that are out there. It all helps, as does digging in and going for it.
Lastly, if you drop the 'forum' from the search terms, and use site:cakewalk.com, (and your terms), it will search forums as well as the Sonar documentation itself, which may give you helpful results, as well.
Bob Bone