The commands you provided perform a series of Git operations on your local repository. Let's break down what each command does:

git checkout develop:

This command switches your current working branch to "develop." You will now be on the "develop" branch, assuming it exists in your repository.
git fetch --all:

This command fetches all updates from all remote repositories that your local repository is aware of. It does not make any changes to your working directory but brings in changes from remote branches that you don't have locally.
git reset --hard upstream/develop:

This command performs a hard reset of your current branch to match the specified branch, which is "upstream/develop" in this case. A hard reset discards all your local changes and moves the branch pointer to the specified commit, effectively making your local branch identical to the specified branch.
"upstream/develop" is a common naming convention for the remote repository's "develop" branch. It assumes that you have set up a remote named "upstream" that points to another Git repository (usually the original repository or a fork).