Most Apps have a search box that lets you search within the app. The obvious thing is ⌘-F and the text search box opens, like this:
Then I noticed that ⌥ – ⌘ – f will open the app search for almost every application.
Now that makes my keyboard workflow a lot faster. ⌘-F for searching for text in the existing mode, and ⌥ ⌘ F will quickly move the cursor up to the application finder.