Not many people know WhatsApp now allows bold, italic and strike through text. However it’s hidden as there no button to apply the text formatting.
To bold up, you need to but an asterisk on either side of the word, like *this*, while italics need an underscore on either side of a _word_, and strikethrough a tildes (those squiggly hyphens), just like ~this~. Feeling jazzy? You can even combine commands for *_bolditalics_* attention grabbing.