The git checkout command is used to checkout a branch. Using -b option allows you to create a new branch in the process. Practical usage: git checkout -b new_branch_name

The rm command is used to remove a file. Using rm -r will remove a directory and all contents within. Practical usage: rm -r dir

The && operator can be used to chain commands in the bash command line. The command sequence will only execute if the previous command completed successfully. Practical Example usage: Switch to a directory and list its contents. cd dir && ls