What is The eighth jhana and how can i practice it?

I am new to meditation. If i understand correctly there are two types of meditations, Two forms of meditation eight jhanas and vipassana (insight). One thing that capture me and made me want to start meditating was the ability to focus my mind on anything i wish to deeply focus on. To have a understanding with my mind and work with it. I feel like eight jhanas is the best method but i dont understand how to begin. I looked it up but lost. Any ideas?