Welcome to the Board. Now the FIRST thing you need to do is back-up a step and notice those
BIG RED LETTERS on the opening page. Within that sentence you will see a reference to the FAQ and the comment that you should actually read it
and search
before you post. But you were in such a hurry to ask your question, you just blew right on by, now didn't you.
So, time to go back and actually read the FAQ and learn how things are supposed to be done around here.

Try using the SEARCH button at the top of the Forums, as is suggested by that FAQ, enter the word "bruteforcing" (without the quotes) and you will find several threads discussing this issue.
If you "wannabe" a cracker, you have to learn how to search the net. If you don't know how to do that, there is a link to a site know as "Searchlore" which is run by the original founder/inspiration of this site. There you will learn how to search more effectively.
However, this is not a difficult search topic at all. Just go to your favorite search engine and enter; "bruteforcing and tutorial" (again without the quotes) and you will find plenty to read, including several tutorials included in some of the collections linked at the bottom of these Forums.
Regards,