Does anybody have good tutorials for Inkscape?

I especially would like to know how to apply a perspective on a flat drawing and how to only delete some edges and not the nodes.

To be more detailed about the image I try to create, I managed to draw a table in perspective (with the 3D tool) and a flat smartphone (with the square tool). How can I transform this smartphone to be in perspective and to lay on this table?

I'm kind of struggling now 😅

#Inkscape #Graphism #opensource