Anyways, the thesis is the main idea or your claim in the essay. If you are really into English structure and so forth, look up Toulmin’s Model online (Yahoo or Google it) and also remember the syllogism that Socrates created as:

Main Claim: All Men are mortal

Second Claim: Socrates is a man

Therefore, Socrates is mortal

Toulmin explains this in depth.

Now for an easier explaination: What point do you want to make in your essay? The answer to the question should be your thesis ex: Violent video games do not create violent people, people are violent by nature. THen follow this up with supporting ideas.

Good luck!

“What makes a A Thesis Sentence ‘Good’ ”

Following arguments should be about: quality, relevance, and the ability to summate complex ideas.