If you missed my live Inkscape classes, don't worry.  This, approximatly 90 minute, recording of one of those live classes goes over all of the basics of Inkscape to help you better understand it's functions.  
 
This course includes how to turn photos into SVG files, create and edit paths, make custom mockups, and much more.  If you still have questions after watching the course, feel free to reach out any time for help