The git push -u command is used to set an upstream branch for your current branch. The -u option stands for "upstream."
When you push a branch to the remote repository for the first time or when you want to set the upstream branch, you can use the -u option. For example:
git push -u origin <branch-name>This will push your current branch to the remote repository referred to by origin, and set that remote branch as the "upstream" for your current local branch. The origin is just an alias that usually indicates the original remote repository that you cloned from. You can name it anything you like, but origin is used by convention.
Once you've set the upstream branch with git push -u, you can just use git push in the future on the same branch. Git will know that you want to push to the previously set upstream branch. Similarly, when you're on that branch, you can use git pull without specifying a branch, and Git will know to fetch and merge from the corresponding upstream branch.
It's a way to link your local branch with a remote branch so that future pushes and pulls on that branch can automatically know which remote repository and branch to operate on.
