system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 How do you use git and github?
gpt
5 year old explanation:

You and Billy decide to draw a picture together with crayons, but you both want to be able to work on it from home. The teacher makes 2 photocopies of what you have started and you both take a copy home (pulling/checking out). You both add more things to the drawing and when you come back to school tomorrow, the teacher cuts and pastes the bits you added / changed and then photocopies that (merging). If you both colored in the same area, someone has to choose which portion to use (resolving a conflict). And since there are photocopies every time something is changed, you can throw away all the new ones if you don't like what you've done (reverting).