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<font color="red"> I have to write a white paper about web testing for present it to QA Team , so I need help? Any related subject to web testing to complete my presentation
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You are asking questions that to give complete answers would take at least chapters in books.
Do you have any experience in testing web or not? It sounds like you have been asked to write a paper about a subject that you know nothing about.
I would suggest that maybe you need to search for articles on Web Testing and maybe get some knowledge on these. Be warned though writing and presenting a white paper on something you have no or little knowledge on will give you problems when questions are asked in your presentation.