Undoing Things

git commit --amend: when you commit too early and possibly forget to add some files
```
$ git commit -m 'initial commit'
$ git add forgotten_file
$ git commit --amend
```
git reset HEAD <filename>: unstaging a Staged File
```
$ git add *
$ git reset HEAD CONTRIBUTING.md
```
git checkout -- <filename>, unmodifying a Modified File

Working with Remotes

git remote add <remote-name> <url>: add a new remote Git repository as a shortname you can reference easily. (you can use the string on the command line in lieu of the whole )
git remote rename <old-remote-name> <new-remote-name>
git fetch [remote-name]: goes out to that remote project and pulls down all the data from that remote project that you don’t have yet.
- only downloads the data to your local repository – it doesn’t automatically merge it with any of your work or modify what you’re currently working on.
git pull: automatically fetch and then merge that remote branch into your current branch.
git push [remote-name] [branch-name]:
git remote show [remote-name]