Zotero Web gives you options to network and collaborate with other researchers, as well as managing your own reference library and groups online. The web library looks very similar to the desktop library.
The Web library tab shows your Zotero library with a layout similar to the desktop version.
The Groups tab shows details of any groups you own, you can manage the group profile and library in this section. In the Groups tab you can also to search for other groups in the Zotero community.
The Documentation tab contains information and step-by-step guides to help you using Zotero from the basics to the more advanced features.
The Forums tab shows conversations and queries posted by and to the Zotero community. You can use Forums to find answers to known issues, or to questions not addressed on the Documentation pages. You can also post your question to the Zotero community.
The Get Involved tab provides information if you want to get involved and help out with the Zotero open-source project.