By inner workings I mean, the blockchain, mining, mining pools, transactions.
It just depends how technically skilled you are. If you are good in programming then you can start with the white paper, source code, etc..
If you are not good with the programming and you just got interested into Bitcoin, then you search for some easier to understand resources. There is so much stuff really. Just Google, go watch videos on YouTube, and read, read, and read.
Also ask questions here if you don't understand something.