You can use Markdown to stylize the text in your YouCanBookMe booking page and email notifications. But it doesn't work on calendar events.
This is because calendar programs strip the translated formatting and expose the formatting code. You can use specific shorthand codes to ensure any links you add to the calendar event description render correctly.
Links that are automatically included by default in your calendar events (for example, the cancel and reschedule links) are already formatted correctly.
However, some calendars, such as Apple Calendar, don't accept this formatting. If you or your clients use Apple Calendar, you can opt to use plain text formatting for these default links.