CTRL-F is one of the most useful keyboard shortcuts when trying to find information in a document. It works in your word processor, spreadsheets, and on Web pages and PDFs. If you use Mozilla’s Firefox Web browser, you can grab the Findlist browser extension to make your find function work harder. Lifehacker has a great review of how it works: you get a drop-down menu of up to 50 recent terms you’ve looked for with CTRL-F. The extension will be useful if you use CTRL-F on one page, then flip to another and have to rerun the search. Skip retyping and select from your list.