inkscape usage(shortcut)

b Bessel curve
c Calligraphic
d Dropper
e Eclipse
f
g Gradients
h
i spIral
j
k
l
m
n edit path by Node
o create diagram cOnnector
p Pencil
q Quick look
r Rectangle
S Select
t Text
u fill boUnded area
v
w tWeak objects
x 3d boX
y
z Zoom
[] (ctrl, alt) rotate by 15degree (90 degree/1 pixel)
<> (ctrl, alt) resize by 2 pixel(1 time/1 pixel)
arrow (shift, alt) move by 2 pixel(20 pixel/1 pixel)
arrow (ctrl) move view
click (ctrl) (object in a group)

gradients:
stroke: border color, pattern
filling: solid, gradient