Yes friend you heard write you can use different types of fonts in whattsapp which helps you to write your message to your gf, bf, etc using some of the cool fonts provided by the whatpp.
Whatapp has the cool feature which you have to know about it and you have to use these features.
If you want to write in bold, italic and strikeout follow these steps:-
Bold: Add an asterisk (*) before and after the specific words or phrases you want to embolden e.g. *hello*
Italics: Add an underscore (_) before and after your chosen words or phrases e.g. _hello_
Strikethrough: Add a tilde (~) before and after the words or phrases you want to strike a line through e.g. ~hello~