how to make copies of files in linux shell command make backup copy of file

ok, lets say i am at the command prompt in a linux computer. i am at the command shell and i have a file called userlist.txt and i want to make an exact copy of this file. so how do you do that? well its easy. if i want to make a copy of my file called userlist.txt all i have to do is run this command:

cp userlist.txt new_userlist.txt

by running this command, i just made an exact copy of userlist.txt and named it new_userlist.txt

simple huh