Understanding .GCode files

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1

Hi,
I'm new to 3D printing and OctoPrint. I was reading through the generated GCode files for better understanding and found certain lines at the top of the file starting with ' ; ' Are those similar to comments in other programming languages are do they convey any message to the 3D printer.
Thanks.

2

Anything after a ; (or after a #) is considered a comment and ignored by most printers. OctoPrint usually strips these parts from the gcode before sending it to the printer.

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3

Hi @Abinav_Shankar08!
A good start is the RepRap Wiki.

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4

Pay special attention to the commands which change the mode (absolute versus relative) of the motors and the extruder.

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5

Hi,
I already upgraded my firmware to Marlin 1.1.x. Is there a basic guide for Marlin firmware?