Can you recommend me some books to read. I think I know the basics pretty well and want something a bit more advance. Do you know of any books that are informative and get let me get a more in-depth understanding of islam. Also what field of Islam should I study on. Do you mind recommending me informative lectures?

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You should study theology, our Aqeeda and beliefs

Here are some books:

https://www.al-islam.org/tags/beliefs