Don't connect to public Wi-Fi networks - Beware of connecting to a public Wi-Fi network as there may be someone spying who could gain access to your passwords and other private information, or you could have your session hijacked. Snoopers can set up their own Wi-Fi hotspot, pretending to be your hotel or coffee shop, then once you have connected they can grab any data you send over it. In the past there have been flaws delected in the OS that could allow access to your Mac, such as the SSL error in an earlier version of Mac OS X that meant it was possible for a hacker to access your machine if you were using public WiFi.
What is the book about? Tell your reader not only the main concern of the book in its entirety (subject) but also what the author's particular point of view is on that subject (thesis statement). If you cannot find an adequate statement in the author's own words or if you feel that the stated thesis statement is not that which the book actually develops (make sure you check for yourself), then you will have to compose a thesis statement that does cover all the material. This statement must be brief (a sentence or a paragraph), accurate and comprehensive.