You seem to be confusing Git and Github to an extent, and are using the two names seemingly interchangeably. Git is the version control system, Github is merely an online service for storing and managing your repositories - and it's not the only one. Other examples include GitLab and BitBucket. All of these do much the same thing.
These days, knowing about Git is pretty expected, but not essential... other version control systems exist.
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You seem to be confusing Git and Github to an extent, and are using the two names seemingly interchangeably. Git is the version control system, Github is merely an online service for storing and managing your repositories - and it's not the only one. Other examples include GitLab and BitBucket. All of these do much the same thing.
These days, knowing about Git is pretty expected, but not essential... other version control systems exist.