To facilitate the onbarding of your users, it might be useful to display some key general information right from the homepage of your platform (purpose of the platform, key contact people,...).
For this, you can edit a 'welcome message'. This one will be displayed at the top right hand corner of the homepage.
You will have access to the same type of editor as for new stories. As such, you'll be able to use titles, quotes, lists etc. to structure your message.