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"Hey, I found this fantastic theme! Can you customize it?" Of course I can. But it's analogous to going to the house contractor and saying, "Hey, I saw this gorgeous house. Can you build it?
If you know one little trick, you can use Google's powerful search engine to search for any content on a single site--even if that site doesn't have a search function.
If your administrative login is still the default "admin" you're basically giving a headstart to the hackers. Now all they need to do is guess your password.
I have tried to stay away from Custom Post Types (not a post or a page, but another type of "post" in WordPress) in case I change themes or plugins and they're no longer compatible or friendly or just don't work the way I want them to.