This tip is pretty useful for users who tend to open a lot of tabs in their web browser window.
To open a new site in a new tab, you can either open a new tab and enter the URL.
Or you can just type the URL in the Omnibox on the current tab and press alt-enter.
You can also press ctrl+T from any tab to open a new tab with cursor blinking in the omni box.
Doing that would automatically open that link in a new tab in the same window.