Opera also has a search shortcut if you want to look up something on the internet or jump to a tab. It's called Instant Search and it can be fired up either by tapping the search icon on the sidebar or pressing Ctrl+Space for tab search and Alt+Space for web search.
With Instant Search, you can execute a query on Google or search an active tab by switching modes which itself can be done by pressing the Tab key. In case Instant Search is not enabled by default on your machine, you can turn it on from the Settings.
