As you modify code and add code in your local repository, these changes are not actually in the local repository. In other words, the local repository does not know what the new changes are.
Modified and new files must be commited to the local repository. This is done with two commands: git add and git commit. The add command marks which files are to commited. A list of new and modified files can be listed using the git status command.
Once one or more files have been flagged for being commited, run the git commit command. This command will request a message that describes the changes made. When this command is run, git will make a snapshot of the current changes being commited, store the commit message and create a set of deltas or patches that allow for any future attempt to get a copy of the branch at one of the previous commit nodes.
Files that are commited to the local repository can only been seen on the local repository. In order for other programmers to see these changes, the remote repository will need to be updated. This is done using the git push command. This command will sync the remote repository with the local repository.
See the Git CLI Commands lesson for details on the git commands listed above.