The citations that Zotero generates are based on the information provided by a database, which won't necessarily be perfect. You can't trust that a Zotero-generated bibliography will be 100% ready for you to copy and paste into your paper, but Zotero can help you get started so that you won't have to create your bibliography from scratch, saving you a great deal of work.
Double-check the items in your Zotero-generated bibliography against our citation guide or an official style handbook to make sure that they're in accordance with the style you're using.
Once you have a selection of items you'd like to turn into a bibliography, it's easy to do so.
Select the items that you want in your bibliography, then press the "Cite" button above your items:
A window will pop up in which you can choose your citation format (for example MLA or APA). Once you choose your format, your formatted citations will appear in that window, ready for you to copy and paste: