?Fibonacci

Fibonacci[6]

?Rectangle

r1=Rectangle[{x1,y1},{x2,y2}]

r1[[1]]

r1[[2]]

step[rectPrev2,rectPrev1]

If[1<2,Module[{},
dsfasdf
asd
fasd
f
asdf
asdfasd
fads
fasdf
],
Module[{},
dsfasdfa
sdf
asdfasdf
asdf
]
]

m={{a,b},{c,d}}

m[[1,1]]

mm=MatrixForm[m]

mm[[1,1]]

?MatrixForm

This is how you go back from MatrixForm to inputForm :

mm[[1]]

MatrixForm[m] //InputForm

?.

(({{a, b}, {c, d}})).(({{x, y}, {w, z}}))

mm[[1]][[2,2]]

?NestWhileList

mm[[1,2,2]]

Graphics[{Rectangle[{0,0},{1,1}]},Axes->True]