I have, or at least I tried, to create my own strategy chart which automatically gives me the best play considering the remaining cards to be delt. I simply used excel spread sheets similar to the video on youtube from Michael Shackleford: https://www.youtube.com/watch?v=jCF-Btu5ZCk&t=236s . But, I included slightly different rule sets used by the online live casino at which I play blackjack.

I update the spreadsheet by clicking buttons corresponding to the delt cards similar to this youtube video : https://www.youtube.com/watch?v=sGmXJBQIzmI. It automatically updates the count and house edge for each deck composition as well.

My question is if there are any good books/sites which can teach me more about the probabillity's of BJ for finite deck compositions and different rule sets?. I cannot find any good sources which can show me the math behind the strategy chart / house edge for finite decks. Probabillity math is fairly new to me and I would like to double check my calculations from the spreadsheet. I find that the house edge from my spreadsheet does not exactly correspond to the house edge generators on the internet. I bet I've made some small errors in my math somewhere.