I have a cat named Peach, and now you're probably wondering what she's dealing with a website. Well, she is a personal, unique and wonderful cat with whom there is only one of the whole world. And - it should preferably the content of your website be too.. I mean, not a cat, but personal, unique and wonderful.
It may be tempting to use the same content in multiple places on your site, or to copy text from another site. However, this is not a good idea. Most websites have copyright on their content, and if you use it without permission, you may be asked to remove it.
Google values unique content on the pages, and the same content on multiple pages only causes the pages not to be indexed by Google. So it's a good idea to make sure that each page is unique and has relevant content in relation to what your site is about. Link to other websites, but only if it can complement your own informative and relevant content.