[Q] What knowledge should I get know to if I want to port a rom?

I have a 2012 xperia device and I still love it very much.And I love Sony's latest stock rom too.
So I want to port Xperia X stock rom's feature to my Xperia TX's CM. But I don't know how to do ...
If I want to do something like I mentioned above, what kinds of knowledge should I get know to?

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