Create a free Zotero online account. Creating an online account will allow you to sync and access your web-based Zotero library from any device. Log in to your account from anywhere to access your synced library.
Download the Zotero desktop app. The standalone desktop version of the software that can be accessed from your personal computer. Sync the desktop app with your account (Windows: Edit > Preferences > Sync // Mac: Preferences > Sync)
Download the Zotero web-browser extension. Zotero Connectors automatically sense content as you browse the web and allow you to save it to Zotero with a single click. Zotero is compatible with Chrome, Firefox, Safari, and Edge. Chrome is the preferred browser, but you can select "Zotero Connectors for other browsers" to view more.
Check that the metadata imported correctly. If you see errors in metadata, such as capitalization or incorrect information, correct it as you add to increase findability and save time later on.
Option 2: Manually add items to your collection using the green new item button at the top-left of the center pane.