You can also save webpage information to Zotero. This can be hit or miss, as not many webpages have the amount of embedded information that articles and book pages do. This means that often the only information Zotero will be able to pick up about the webpage is the title and perhaps the year it was last updated.
However, one particularly useful thing that Zotero does with webpages is that it saves a screenshot of the webpage. That way, even if you're offline or the page has been updated, you'll see be able to see what it looked like when you saved it.
To save webpage information, the Zotero button will have an icon that looks a little like the article icon, but different. Click that.
As seen in the screenshot below, Zotero didn't capture much information about the webpage. But it did capture a screenshot, which is very important when citing webpages since they change so very often.
Remember that if for some reason Zotero didn't copy the citation info correctly, you can always edit it manually: