Zotero allows you to create bibliographies from saved citations in a range of common citation styles. There are two main methods to create a bibliography.
The first is to create a bibliography from a collection or subcollection. To do so, right-click on a collection and click "Create Bibliography from Collection".
To create a bibliography from specific items, CTRL+Click on multiple items, right click and select "Create Bibliography from Items".
A box will pop up where you can choose the desired citation style. For Harvard, select "Cite Them Right 12th edition - Harvard" - this is the version used at St. George's. For Vancouver, select "Vancouver".
Under "Output Mode", you can select if you want a list of in-text citations or a full bibliography. Under "Output Method", you can select the format you want the bibliography in. The example below shows a bibliography copied and pasted into Word using Zotero:
