How to bold or italic font on Telegram?
Bold: Double * = **hello world**
Italic: Double _ = __ hello world__
Monospace: Triple ` = “`hello world“`
You can highlight the text and then press the three-dot button in the upper right corner. It will present you with a choice of formatting options. Do it twice and first choose one formatting and then the other. The text will be bold and italic as a result.