This creates a duplicate file. Syntax is cp sourcefile newfile. Options are on page 159. This does not create a new file, it just moves or renames an existing file. It's often used so that you can type in one word to refer to a long, involved pathname.
Syntax is wc filename.
The options are on page 165. With no options, the wc command displays three numbers, representing number of lines, number of words, and number of characters, respectively. Often, you'll want to refer to or search for more than one file at a time, without naming each file individually. The file substitution metacharacters are used for this. The tail command is used to view the last lines of a file.