MY first code - SimpleMine

Hey guys im new to computercraft, coding and this forum. this is my first code ive written, might be messy, might be 'lame' but im happy with it. feedback is welcomed :)/> pastebin.com/wQ9itZ43

would like to know what it does first :D/>

Not bad actually, it's a tunneling script incase people don't know enough lua to tell, it works quite well, a good feature would be to record how far it's travelled and make it come back to where it started when it's got just enough fuel to do so.