Question regarding Ethereum source code

Hello guys,
Maybe any of you know where I can find Ethereum source code? I'm kind of new in developing field and I'm actually really interested into seeing an Ethereum source code.
As I know Ethereum is open-source so there must be core code somewhere on GitHub?
Sorry if the question is stupid, haven't got answer in google so trying to ask there 😉
submitted by /u/L1nasas97
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