Rich formatting
While it's not universally supported, you can use rich formatting in a number of iOS apps including Mail, Notes and third-party apps like WhatsApp to make certain sections of text stand out. But while it's easy to use, it's also extremely easy to miss.
Just open an app that supports rich formatting, highlight the text you'd like to edit by double-tapping it and select the formatting menu (BIU for all the formatting options). From there, simply select your preferred effect and it'll be applied to the selected text. It's as simple as that!
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