No questions or discussions are allowed in this section, this is Introductions Only. Please post your question in the proper forum making sure that you properly explain what you question is INSIDE" the post, simply posting a thread title is not sufficient.
Also, please don't ask vague, general, open-ended questions like this, that would require a whole textbook chapter to answer "completely." Try to understand at least part of some introductory material from a textbook or web site. Then ask questions here about specific things that you don't understand, preferably with a link or reference to where you read it.