What are the 8 gates of paradise? Which one of the gates is the "highest"? Is there such a garden called, "the garden of essence" (jannat al-dhat) or the "garden of vision" (jannat al-liqa)?

You may find the details on the gates of heaven in this video:


As for Jannat al-Dhat, some philosophers have mentioned it but there is no hadith evidence for it. It’s a claim. Same with Jannatul Liqa'