I agree with jec1 above in that the ShaunaKelly provides great assistance in all forms of Word processes. Here is another link that addresses "styles" that may assist you:

http://shaunakelly.com/word/styles/tipsonstyles.html

Of course, there are links within that link that you should follow if you really want to understand the process. You have to be patient and follow instructions provided. If you do, you will come away with a better understanding than what had in your original post.