What statement best describes Git's concept of HEAD?

After staging changes to several files, you realize the changes to the confin.properties file are incorrect, and need to be removed from the stage and working directory. What command can you use to remove the staged changes to the file?

After a recent release with a stack trace, an issue is create that indicates the problem is with a newly added configuration property named MaxConnections. What command can find all commits that add or remove the string MaxConnections?

What shortcut creates and checks out a branch simultaneously?

How do you add all the files in a subdirectory called ../project/experiment?

What command creates a git repository in your current directory?