Just for some more information - I'm a bit bored. You can also click on the "Opera" in the upper left, click on page, and select Find in Page to do the same thing. How about some more that I find handy?
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CTRL + L highlights the address bar and you can type/search for new pages immediately.
Double click a word to highlight it all - great for right click > search.
CTRL + Z will undo a mistake in text entry boxes like this comment.
CTRL + N is a new window.
CTRL + T is a new tab.
CTRL + SHIFT + N is a new private tab (history is wiped immediately when closing).
CTRL + R reloads the page.
CTRL + D bookmarks a page.
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Those are the shortcuts that I use most frequently. There are many more but those are the ones that I prefer and tend to use on a daily basis.