Overview of G variables (incomplete)

G-code wiki page

G1 Command for the activation of the linear interpolation

G64 Continuous-path mode with reduced velocity as per the overload factor
G642 Continuous-path mode with smoothing within the defined tolerances
G645 Continuous-path mode with smoothing and tangential block transitions within the defined tolerances

G90 Set to absolute programming
G91 Set to incremental programming

M30 End of program, with return to program top

X The x-coordinate
Y The y-coordinate
Z The z-coordinate
C Nozzle rotation
F Nozzle velocity