Explain Nietzsche to me like I was a 10yo

I recently became more fond of modern philosophy and dove into Camus work, am now starting The Stranger, but a lot of Nietzsche references have been showing up to me and I would really like to understand the general idea, how do you take his thoughts?

Is there a book in his literature that will give an overall view of his work? If not, pick a “must read” please. How did this knowledge affect your beliefs and life?

Disclaimer: sometimes only the prolonged exposure to a method can make one understand it, but I was hoping getting the feedback from those who understand this stem could make my baby steps easier.