HOW TO INSERT ADSENSE AD ABOVE FEATURED IMAGE OF POST?

Hi there,

You can create a hook element for it:
https://docs.generatepress.com/article/hooks-element-overview/

There are several hooks available depending on where you want to place the ad:
https://docs.generatepress.com/article/hooks-visual-guide/#single-post

Let me know if this helps :)

WHAT IS THE HOOK FOR ABOVE FEATURED IMAGE OF POST SEE SCREENSHOT ABOVE

Try the before_content hook.