Hola Jesús!
If you know the "ins & outs" of something, you know how to make it work/ function such as, Computers, Cars...etc.
"Ins & Outs" means the detailed fact, the function or the mechanism of something.
Hope it helps!
Billy
2017年1月28日
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Ins and outs mean all the details. So this sentence means "I don't know all the details of the matter."
2017年1月28日
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It just means details. Imagine knowing something so well that you know the inside of it and the outside of it. Then you would know the "ins and outs" of it.