What is Done-for-you Content (PLR)?
PLR stands for "private label rights". In simple terms, private label rights lets you purchase articles, eBooks and other content and so almost anything with it. You could use the articles for blog posts and put your name to them, release them as eBooks and sell them and so on. You don't have to give us credit!
You can add to them, change them, or just use them as a foundation for something new. You can even give them away for free to build your email lists! The only thing you can't do is pass on the rights for your customers to use them in this way. They can only use them for informational purposes (though you should always check individual PLR sellers' terms before you use it in case they're more strict).