How to get Bitcoin historical data from Bitcoin-Core? I installed Bitcoin-Core Wallet and downloaded the whole 130gigs BlockChain. Now I'd like to read the BlockChain Data to know all bitcoin values since the beginning. Not sure how to start. I need that data for making my own graphs in Excel

How can I read data from the whole BlockChain? Thanks.
It sounds like you are asking how to build a block explorer. Basically you would activate the full transaction index by adding txindex=1 to your bitcoin.conf. Parse all the history data and dump it into a database. Then keep track of all the new transaction data on your own database as blocks come in with blocknotify or real-time with ZMQ notifications.

https://github.com/bitcoin/bitcoin/blob/master/doc/zmq.md#usage

There's also options like bitpay's bitcore that pretty much does the work for you. It does require a lot more HD space though.