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This command moves the turtle forward (num) steps. The turtle lines a trail if the pen is down. FD is same command.
ex)
FD 100
FD rand(100)

This command backs the turtle (num) steps. The turtle lines a trail if the pen is down. BK is same command.
ex)
BK 100
BK rand(100)

This command orders the turtle to turn left (num) degree. LT is same command.
ex)
LEFTTURN 50
LT 30

This command orders the turtle to turn right (num) degree. RT is same command.
ex)
RT 50

This command orders the turtle to turn up (num) degree.
ex)
UP 30

This command orders the turtle to turn down (num) degree. DN is same command. ex)
DN 30

This command moves the turtle to the left (num) step. The turtle keeps same sense. ML is same command. ex)
ML 30

This command moves the turtle to the right (num) step. The turtle keeps same sense. MR is same command.
ex)
MR 30

This command moves the turtle to the up (num) step. The turtle keeps same sense. MU is same command.
ex)
MU 30

This command moves the turtle to the down (num) step. The turtle keeps same sense. MD is same command.
ex)
MU 30

This command rotate the turtle to the left (num) degree. RL is same command.
ex)
RL 30

This command rotate the turtle to the right (num) degree. RR is same command.
ex)
RR 30

PENDOWN commands the turtle to line when the turtle moves. PD is same command. PENUP and PU are the inversion.
ex)
PU ML 30 PD FD 100