Press Command + F in most apps to open search
Type the word you want to find
Press Return or Enter to jump to the next match
Use Command + G to find the next occurrence
Use Shift + Command + G to find the previous occurrence
In Safari, press Command + F to search the current webpage
In Finder, press Command + F to search files and folders
In Pages, Notes, Word, and similar apps, use Command + F to search within the document
In Spotlight, press Command + Space and type the word to search your Mac
In Mail, use Command + F to search the open email or mailbox
In Messages, use Command + F to search the current conversation