First you’ll need a slider plugin of some sort – there’s tons of them out there if you do a quick search.
All slider plugins will generate a shortcode when you create a slider.
This shortcode is what you can place in GP Hooks to show the slider site-wide, or our Page Header to show it on a specific page.
You can check out our videos on the Page Header add-on to see us using an example slider: https://generatepress.com/knowledgebase/generate-page-header/
Let me know if you need more info 🙂