How to add favorites listing on homepage tab section?

Hi and I have been using classiads theme. I have a couple of questions related to the use of shortcodes on tab section using old homepage editor.
1. I want to display listings that are marked as favorite by logged in users to display on homepage. Currently, the favorite feature is working based on query string in this theme. Does anyone have a query-string for [LISTINGS] shortcode that works for the same?
2. I also want to display add to favorite button on each listing. How do I do that?
3. I want to provide user the ability to switch between list/grid layout on homepage on tabs section.
Any help will be appreciated. Thank you.