How do I lock my iMac? (So that only I can use it)

I'm going to be having someone I don't know come in my house and take care of my cats over the holidays. How do I make sure he can't get in to my computer?

If I were you, I'd very seriously rethink that whole idea: you shouldn't just be worried about your Mac - how about the rest of your furnishings, clothes, car, appliances, and so forth. I would not ever trust a stranger, especially one found on craigslist. I don't want to alarm you as much as warn you; in my neck of the woods, there have been horror stories about people found on craigslist.
As for your Mac, if you only have one account and designate that a password has to be entered at time of login, all you need to do is log out when you shut down your Mac. If it is booted up, they'll be met with a login/password screen and that's all - they won't be able to get any further unless they know the password.

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