Is there a site with tips for difficult passages (like alternative fingerings) for awkward passages, like for example low F# to C#, so that they sound smooth? I have my own trick for this, but just so you understand what I mean...
Maybe there are advanced exercises that address these problems rather than a list of tips or alternate fingerings, I don't know.
It is probably also a good idea to write down a list of tips or tricks for difficult transitions that you find yourself or that you read here from time to time, which I have not done...