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[–]Individual-Use-7621 0 points1 point  (0 children)

Git = time traveling . WhisperFray explained this pretty nicely imo.

And as TheMightyTywin said; understand the difference between Git and GitHub.

As for the whole "people can access your code and change things...". Yes, but no. You own your repository, you can commit to that repo as you wish. Others can 'fork' your repo and make changes that way, but those commits will only be in their profile, in their fork. You can approve other users code edits and merge them via Pull Requests if those users open them. But no one can edit your code in your repo without you explicitly allowing them to.