This command will remove the file without prompting you, to ensure you literally want to delete it.
rm myFile.txt
How to delete a file using WildCard (-f forces the command, so you will not be prompted.)
This will delete all .txt files
rm -f *.txt
This command deletes the directory and everything within it. (r=recursive and f =force)
rm -rf /path/to/directory
This command will delete the file and display information (v=verbose)
rm -v myFile.txt
This last command is how you delete a file interactively. (-i will create a prompt and can be used on any command above. As long as you replace the i with the f)
rm -i myFile.txt