Finding Help for Inkscape
If you want to read up on more advanced features of Inkscape, Inkscape: Guide to a Vector Drawing Program by Tavmjong Bah (currently covering Inkscape 0.92) is the standard textbook on it. There is also a series of tutorials on Inkscape’s homepage.
The keyboard and mouse reference provides an overview of tool and dialog shortcuts and can help you speed up your workflow.
Taking apart other people’s work can be a good way to learn something. Maybe you find inspiration while browsing Inkscape’s gallery.
Lastly, if you’re reading the PDF version of this guide, check out Read the Docs for updates to it.